# P.O. Plus, San Francisco: a mailbox rental service in San Francisco (2026 guide) Source: Local AI Registry, https://localairegistry.com/biz/ca/san-francisco/p-o-plus-san-francisco-ca. Free to reuse with a link back. By Steve Lee, founder and CEO of Local AI Registry. Fact-checked against 4 sources. Updated 2026-10-14. Owner review: not yet. Canonical: https://localairegistry.com/biz/ca/san-francisco/p-o-plus-san-francisco-ca ## Photos - ![Photo 1](https://localairegistry.com/api/photo?src=https%3A%2F%2Fseoaesthetic-assets.sfo3.cdn.digitaloceanspaces.com%2Fphotos%2Fcmsp5wgne00lvyepdck71i9v4%2F0.png) - ![Photo 2](https://localairegistry.com/api/photo?src=https%3A%2F%2Fseoaesthetic-assets.sfo3.cdn.digitaloceanspaces.com%2Fphotos%2Fcmsp5wgne00lvyepdck71i9v4%2F1.jpg) - ![Photo 3](https://localairegistry.com/api/photo?src=https%3A%2F%2Fseoaesthetic-assets.sfo3.cdn.digitaloceanspaces.com%2Fphotos%2Fcmsp5wgne00lvyepdck71i9v4%2F2.jpg) - ![Photo 4](https://localairegistry.com/api/photo?src=https%3A%2F%2Fseoaesthetic-assets.sfo3.cdn.digitaloceanspaces.com%2Fphotos%2Fcmsp5wgne00lvyepdck71i9v4%2F3.jpg) - ![Photo 5](https://localairegistry.com/api/photo?src=https%3A%2F%2Fseoaesthetic-assets.sfo3.cdn.digitaloceanspaces.com%2Fphotos%2Fcmsp5wgne00lvyepdck71i9v4%2F4.jpg) ## In short P.O. Plus is a mailbox rental service in San Francisco, CA. Its AI Score is 50 of 100, which is fair. Every fact on this page carries one of three marks: Confirmed (from their website, Google Business Profile, review sites, licensing boards, or measured by Local AI Registry), Visitor submitted (added by a person, with a date and how they know), or AI guess (what AI engines like Gemini and ChatGPT are saying, not confirmed by anyone). Every mark points to a reference at the end of this page. ## Key facts | Fact | Value | | --- | --- | | Type | Mailbox rental service | | Address | 584 Castro St, San Francisco, CA 94114, USA | | Hours | Mon to Fri 9 AM to 6 PM · Sat 10 AM to 3 PM · Closed Sun | | Phone | (415) 864-5888 | | Owner | Nothing found | | Rating | 4.4 across 71 reviews on Google | | Known for | P.O. Plus excels in providing reliable PO tracking and a wide range of office supplies, making it a go-to spot for shipping and mailing needs in San Francisco. | | Prices | Nothing found | | Quietest time | Nothing found | | Parking | Nothing found | | Last verified | October 14, 2026, 8:40 AM | ## All the details Every row is something the owner can add or correct. Each one is marked Confirmed, Visitor submitted or AI guess, with where it came from. | Group | Fact | Value | Mark | Evidence | | --- | --- | --- | --- | --- | | Location info | Address | 584 Castro St, San Francisco, CA 94114, USA | Confirmed | Google Business Profile, checked Aug 11, 2026 | | Location info | Description | PO Plus has been San Francisco's trusted shipping store, print shop, and mailbox rental center since 1982. Located in the Castro District, we provide professional printing, shipping, and business services for individuals, small businesses, nonprofits, and organizations throughout San Francisco. Our print shop specializes in business cards, flyers, brochures, postcards, banners, posters, foam board signs, blueprints, invitations, marketing materials, and large-format printing with fast turnaround and exceptional quality. Whether you need one copy or a high-volume print run, we're here to help. We also offer domestic and international shipping, expert packing services, package drop-off, document printing, copying, scanning, faxing, laminat... | Confirmed | Google Business Profile, checked Aug 11, 2026 | | Location info | Hours | Mon to Fri 9:00 AM to 6:00 PM · Sat 10:00 AM to 3:00 PM · Sun Closed | Confirmed | Google Business Profile, checked Aug 11, 2026 | | Location info | Name | P.O. Plus | Confirmed | Google Business Profile, checked Aug 11, 2026 | | Location info | Phone | (415) 864-5888 | Confirmed | Google Business Profile, checked Aug 11, 2026 | | Hours | Monday | 9:00 AM to 6:00 PM | Confirmed | Google Business Profile, checked Aug 11, 2026 | | Hours | Tuesday | 9:00 AM to 6:00 PM | Confirmed | Google Business Profile, checked Aug 11, 2026 | | Hours | Wednesday | 9:00 AM to 6:00 PM | Confirmed | Google Business Profile, checked Aug 11, 2026 | | Hours | Thursday | 9:00 AM to 6:00 PM | Confirmed | Google Business Profile, checked Aug 11, 2026 | | Hours | Friday | 9:00 AM to 6:00 PM | Confirmed | Google Business Profile, checked Aug 11, 2026 | | Hours | Saturday | 10:00 AM to 3:00 PM | Confirmed | Google Business Profile, checked Aug 11, 2026 | | Hours | Sunday | Closed | Confirmed | Google Business Profile, checked Aug 11, 2026 | | Services | Service | Banner printing | AI guess | Nothing found | | Services | Service | Blueprint printing | AI guess | Nothing found | | Services | Service | Brochure printing | AI guess | Nothing found | | Services | Service | Business card printing | AI guess | Nothing found | | Services | Service | Custom printing | Confirmed | Business website, checked Sep 18, 2026 | | Services | Service | Flyer printing | AI guess | Nothing found | | Services | Service | Foam board sign printing | AI guess | Nothing found | | Services | Service | Invitation printing | AI guess | Nothing found | | Services | Service | Large-format printing | AI guess | Nothing found | | Services | Service | Mailbox rental | AI guess | Nothing found | | Services | Service | Postcard printing | AI guess | Nothing found | | Services | Service | Poster printing | AI guess | Nothing found | | Services | Service | Private mailboxes | Confirmed | Business website, checked Sep 18, 2026 | | Links | Facebook | https://www.facebook.com/poplus | AI guess | Business website, checked Oct 14, 2026 | | Links | Website | https://www.poplus.com/ | Confirmed | Google Business Profile, checked Aug 11, 2026 | ## Services and prices These are the 2 services P.O. Plus offers, with the price where we have one and where it came from. | Service | Price | Price mark | Price evidence | Service mark | | --- | --- | --- | --- | --- | | Custom printing | | | | Confirmed | | Private mailboxes | | | | Confirmed | ### Known for P.O. Plus excels in providing reliable PO tracking and a wide range of office supplies, making it a go-to spot for shipping and mailing needs in San Francisco. ## The team Nothing found ## Visiting P.O. Plus Address: 584 Castro St, San Francisco, CA 94114, USA. Phone: (415) 864-5888. Hours: Mon to Fri 9 AM to 6 PM · Sat 10 AM to 3 PM · Closed Sun. (Confirmed, Google Business Profile, checked August 11, 2026 at 2:18 PM.) ### Location info from Google Business Profile Business description, written by P.O. Plus on its Google Business Profile: "PO Plus has been San Francisco's trusted shipping store, print shop, and mailbox rental center since 1982. Located in the Castro District, we provide professional printing, shipping, and business services for individuals, small businesses, nonprofits, and organizations throughout San Francisco. Our print shop specializes in business cards, flyers, brochures, postcards, banners, posters, foam board signs, blueprints, invitations, marketing materials, and large-format printing with fast turnaround and exceptional quality. Whether you need one copy or a high-volume print run, we're here to help. We also offer domestic and international shipping, expert packing services, package drop-off, document printing, copying, scanning, faxing, laminat..." ### When to go Busy times not read yet, back on Scan Day. ### Parking and getting in Nothing found ### Nearby | Place | Type | Distance | | --- | --- | --- | | Heroic Italian San Francisco | Italian restaurant | 1 min walk | | Castro Tarts | Cafe | 1 min walk | | Castro St & 19th St | Bus stop | 1 min walk | | Anchor Oyster Bar | Seafood restaurant | 1 min walk | | Leadbetter's Bake Shop | Bakery | 1 min walk | | Thai House Express Restaurant | Thai restaurant | 1 min walk | ## Reputation 4.4 average across 71 reviews: Google 25. (Confirmed, read August 11, 2026.) P.O. Plus stands out for its community feel and diverse services, though customer experiences can be affected by individual staff interactions. (AI guess, from 71 reviews.) ### What people like - Notary services by Shelby - Efficient package handling - Friendly and helpful staff ### What people do not like - Inconsistent service quality from certain employees - High printing fees compared to competitors - Slow service during busy times ### Press No press story about P.O. Plus found yet. ### Awards None named yet. ### Directories Directory listings not read yet. ## Recent updates from P.O. Plus P.O. Plus hasn't posted an update here yet. ## Questions people ask ### cheaper than P.O. Plus in San Francisco without it being sketchy? No answer yet ### anywhere on Castro to sit while I wait No answer yet ### P.O. Plus or Post Box? No answer yet ### walk ins, or is it booked solid No answer yet ### Booking here, how does it work? No answer yet ### services here, what do people go in for? No answer yet ### best mailbox rental service in San Francisco No answer yet ### Are the hours on Google right for P.O. Plus in San Francisco? No answer yet ### Sundays at P.O. Plus, are they open? No answer yet ### reviews all look glowing, what are the real complaints? No answer yet ### Why do people rate this place? No answer yet ### is there a rewards thing here No answer yet ### walking in for a first visit, what happens No answer yet ### prices round here, anyone got a number No answer yet ### Somewhere to park near P.O. Plus? No answer yet ### anything new from P.O. Plus lately? No answer yet ### Worth the hype at P.O. Plus? No answer yet ## What AI gets wrong about P.O. Plus We ask Gemini and ChatGPT about P.O. Plus. These are the answers that disagree with the record. ChatGPT and Gemini, read by Local AI Registry on Oct 14, 2026. No capture has disagreed with the record yet. ## The AI Score: 50 of 100 The AI Score measures how likely AI engines are to recommend a business, and how accurately. San Francisco mailbox rental services run 22 to 50. Fair starts at 45, good at 65. P.O. Plus scores 50, above the San Francisco average of 33. The same method scores every business on the registry. | Signal | Weight | Score | What it measures | P.O. Plus | | --- | --- | --- | --- | --- | | Retrieval grounding | 26 | 100 | Whether you appear in the ranked results AI retrieves and cites: AI-Overview citations, organic top-10 for your money queries, and the Bing index ChatGPT leans on. | Good | | Off-property attestation | 20 | 40 | Volume and consistency of what others say about you: YouTube mentions, branded web mentions, third-party “best-of” lists. The cause of retrievability. | Poor | | AI visibility | 14 | 0 | Whether ChatGPT, Gemini, Perplexity, and AI Overviews name you, and whether they name you for the right service. | Named in 0 of 12 answers that recommended anyone. 10 more named nobody, which is not a loss and is not scored. | | Reviews & response | 12 | 90 | The star average is only one input. We also read volume, velocity, the specificity of review language, and response cadence. Specific reviews are what AI quotes verbatim. | Good | | Backlink & citation authority | 8 | 57 | Domain authority and editorial quality of the sources that attest to you. | Fair | | Google Business Profile | 8 | 90 | Required and recommended fields; update cadence. The listing AI pulls from first. | Good | | Speed & mobile | 7 | 56 | Core Web Vitals at the 75th percentile, on a real phone. | Fair | | Content freshness & schema | 5 | 37 | Crawl recency, intent alignment, valid JSON-LD, canonicals. | Poor | Full method: https://localairegistry.com/methodology ## How AI decides what to tell you about a mailbox rental service When you ask ChatGPT, Gemini or Google about a local business, the AI doesn't visit it. It reads what's already written about it: the business's website, its Google Business Profile, review sites, news stories and directories like this one. Then it repeats what those sources agree on. That's why AI gets small facts wrong. If Yelp says a place is open Mondays and the website says it isn't, the AI has to pick one. The table above shows the answers that disagree with the record today. The more sources agree, and the more specific they are, the more confidently AI recommends a business. A review that names who helped and what they did tells an AI far more than one that says "great place." ## How to choose a mailbox rental service in California, with or without AI A few checks take ten minutes and tell you more than any rating. - Check that the hours and phone number match on Google, Yelp and the business's own website. Mismatches are how people end up at a locked door. - Read reviews that name a person and what they did. Vague praise is easy to fake. - Look for recent reviews and recent posts. A page nobody has touched in a year may not match the business today. - Ask for the price before you go, and ask what it includes. - Where the work needs a license, ask whose license it is and look it up with California. ## How to read the marks on this page - Confirmed (solid circle): from a known source. The business website, its Google Business Profile, review sites like Yelp, Healthgrades and RealSelf, a licensing board, or measured by Local AI Registry. - Visitor submitted (hollow circle): added or corrected by a person, with the date and how they know, like a phone call or a visit. - AI guess (hollow triangle): what AI engines are saying right now. Nobody has confirmed it. ## About the author Steve Lee is the founder and CEO of Local AI Registry and sets its editorial standards. He is a former Google executive in Search and a former Microsoft executive, with more than 20 years in digital: search, local discovery, and how people find businesses online. He is based in Irvine. - Expertise: search at Google and Microsoft, AI search, answer engine optimization, generative engine optimization, local SEO, structured data and entity mapping. - Industry: medical aesthetics, injectables, med spa operations and marketing. - Disclosure: Local AI Registry sells services to business owners, including P.O. Plus if it claims this page. That does not change what this page says. Every fact carries its source. ## Entity map Every person, place, organization and treatment named on this page, with a stable ID and a public reference. The JSON-LD below connects them to each other. | Entity | Type | ID on this page | Same as | Relationship to P.O. Plus | | --- | --- | --- | --- | --- | | P.O. Plus | LocalBusiness | #business | https://www.poplus.com/ | Subject of this page | | San Francisco, California | City | #city | Nothing found | City P.O. Plus is in | | Local AI Registry | Organization | #publisher | https://localairegistry.com | Publisher of this page | | Steve Lee | Person | #author | https://localairegistry.com/team | Author of this page | ## Topical map Where this page sits in the registry. It's one profile among the mailbox rental services in San Francisco, linked to the lists and towns around it. ### Lists - Best mailbox rental services in San Francisco: https://localairegistry.com/leaderboards/ca/san-francisco/mailbox-rental-service - Best businesses in San Francisco: https://localairegistry.com/leaderboards/ca/san-francisco ### Nearby - /los-angeles: https://localairegistry.com/leaderboards/ca/los-angeles - /san-jose: https://localairegistry.com/leaderboards/ca/san-jose - /san-diego: https://localairegistry.com/leaderboards/ca/san-diego - /irvine: https://localairegistry.com/leaderboards/ca/irvine - /fresno: https://localairegistry.com/leaderboards/ca/fresno - /palo-alto: https://localairegistry.com/leaderboards/ca/palo-alto ### Every list - Every leaderboard in California: https://localairegistry.com/leaderboards/ca ## Frequently asked questions ### What is AI search optimization for local business? Getting a business named when a neighbor asks ChatGPT, Gemini, or Perplexity for a recommendation. Some call it AI SEO, some call it generative engine optimization. Traditional SEO fights for ten blue links; this fights for the one answer an assistant says out loud. The AI Score on this page measures the eight signals that drive it. ### What is Local AI Registry? The public record of how AI sees local business. We score every business we list by one published method, we keep the questions people ask about it in one place, and we never sell rank. Looking up any business here is free. ### How does this page help a business get recommended by AI? Assistants read public pages before they answer. This one states what the business does, what people ask about it, and what the Record answers, in one place a machine can read. Correcting what is wrong here changes what an assistant repeats next. ### Who writes the answers here? Registry AI writes the first answer under every question, from the Record and the public sources named beneath it. Neighbors write the rest under pseudonyms. A registered owner can reply as the business, and their reply says so. ### I own P.O. Plus. How do I fix something or rank higher? Register the page. It is free, it takes about five minutes, and it lets you correct the Record and reply as the business. Nothing on this page is for sale, so the only thing that moves the score is the work. ## References ### Sources cited - [1] Google Business Profile, https://www.google.com/maps/place/?q=place_id:ChIJe84Gzhp-j4ARQiISHhC4SM8 (accessed Aug 11, 2026) - [2] poplus.com, https://poplus.com/ (accessed Sep 18, 2026) - [3] AI engine output: ChatGPT and Gemini, read by Local AI Registry on Oct 14, 2026, https://localairegistry.com/methodology (accessed Sep 18, 2026) - [4] poplus.com, https://www.poplus.com/ (accessed Oct 14, 2026)