Type the ZIP codes you serve. See how many homes are in them, from the 2020 Census, and what it would cost to buy that mailing list and mail every home a postcard, on PostKnock’s Free and Pro plans.
Paste several at once, separated by commas or spaces.
Buying a ZIP gets you every address in it, once. You can mail them all, or mail a batch now and the rest later. Leave “how many” blank to price mailing every home.
Free plan
Mailing —/card
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List + mailing
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Pro plan
Mailing —/card
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List + mailing
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Plus the Pro plan: see pricing
Estimate, not a quote. The home count is total housing units (occupied and vacant) in each ZIP Code Tabulation Area in the 2020 Census. It is not a count of mailable addresses: homes built since 2020, vacancies, and PO-box-only ZIPs all make the real list differ. After you sign up, Find a mailing list shows a live address count from our mailing-data partner, and the exact total before anything is charged. You are never charged for an address you already have, so the in-app price can come in lower. Prices can change: the pricing page is the reference.
Free account, no monthly fee. Your ZIP codes are waiting in Find a mailing list after you sign up.
Sign up free and open Find a mailing list: the ZIP codes you typed here are already filled in. You see a live address count from our licensed mailing-data partner, can narrow it by demographics such as homeowners, and see the exact price before you buy. The addresses import into your account as Current Resident contacts. Already have a customer list? Import it from Excel or CSV instead.
Design your card in the in-app Design Studio (4×6, 6×9, 6×11), pay per piece from your wallet, and PostKnock prints it and mails it First-Class. No minimums, no contracts. Add a QR code to track scans, and on Pro, a phone-call follow-up through the built-in Call Queue for contacts you have numbers for.
What we don’t do: PostKnock does not offer EDDM. Every card goes to a verified address, which is what lets us honor your do-not-contact list and track every send.
Start Free →Per-address list fee
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Per-card price (print + postage)
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Want to pressure-test the budget side? Try the USPS postage calculator → or the postcard marketing ROI calculator →
Sources & assumptions
Home counts: U.S. Census Bureau, 2020 Census, total housing units (occupied and vacant) per ZIP Code Tabulation Area, from the Bureau’s TIGERweb 2020 ZCTA layer (field HU100). A ZCTA approximates a USPS ZIP code; some ZIPs, such as PO-box-only or single-business ZIPs, have none. Prices: PostKnock’s current list fee and per-card prices, loaded from the same figures our billing uses; see the pricing page. Rough-estimate densities are round, labeled assumptions. Response-rate ranges are drawn from published industry benchmarks (e.g. the ANA/DMA Response Rate Report); we use a conservative 2–5% estimated range. Nothing here is a guarantee of reach, deliverability, or results.
Type it into the tool above. The number is the total housing units, occupied and vacant, that the 2020 Census counted in that ZIP Code Tabulation Area, which is the Census Bureau’s version of a ZIP code. It is a good public figure for sizing an area. It is not a mailing-list count: homes built since 2020, vacancies, and ZIPs that are PO boxes only all make a real list differ.
Yes, inside PostKnock. Create a free account and open Find a mailing list: your ZIP codes from this page are filled in, and you get a live address count from our licensed mailing-data partner, free. You can narrow it by demographics such as homeowners, and you see the exact total before anything is charged.
Two parts. The list: a per-address fee on volume tiers, where the whole order bills at the one rate its size lands in. Then the mailing: a per-card price that includes printing and USPS First-Class postage, paid from your wallet. Pro lowers the per-card price and has a monthly or yearly fee. The tool above does the math with our current prices. You are never charged for an address you already have, so the in-app price can come in lower than this estimate.
Buying a ZIP code gets you every address in it, once. You can then mail a small first batch, see how it does, and mail the rest later without buying the list again. If you only want part of a ZIP, narrow the list by demographics in the app before you buy, and the list fee applies to that smaller list.
No. If you already have customers, export a list from the software you use and import it as Excel or CSV; the import wizard maps the columns for you. PostKnock does not connect directly to CRMs or practice-management systems. A list of addresses is always needed, because PostKnock does not offer EDDM: every card goes to a verified address, so your do-not-contact list is honored and every send is tracked.
For when you don’t know your ZIP codes yet. It multiplies the area of a circle by a round, labeled density assumption, or multiplies a number of USPS carrier routes by an average per route. It is a ballpark, not a count, and it leaves out the list fee. Use the ZIP code tab for a real number.
Published industry benchmarks (such as the ANA/DMA Response Rate Report) typically report direct-mail response in the low single-digit percentages, varying widely by offer, list quality, and industry. The rough estimate uses a conservative 2–5% range. It is a planning range, not a guarantee. A strong offer, a tightly chosen area, more than one card, and a phone-call follow-up on Pro all tend to help.
Find the list, design the card, and let PostKnock print and mail it. Pay per piece from your wallet. No monthly fee to start.
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