USPS Delivery Days

Hover over a ZIP code to see delivery days to the rest of the country.

Mailed on

From To

Demo data. These days are made up from distance so the map can be previewed. They are not USPS service standards.

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Origin

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Hover over the map, or click a ZIP to pin it.

First-Class Mail · chance it arrives in…

No ZIP code here: mostly unpopulated land (national forests, deserts, ranges, the North Maine Woods). Census ZIP code areas only cover places where people live or get mail.

Show USPS mail plants

Processing plant Package hub

Plants sort mail for the area around them. USPS doesn't publish which plant serves each ZIP, so the panel shows the nearest one.

About this map, sources and limits

Delivery days: USPS service standards from PostalPro. These are USPS's own targets, from the day mail is accepted. Real delivery can be slower.
Accuracy: days are looked up by the first three digits of each ZIP code, so every ZIP that shares a prefix gets the same color. Since 2025, USPS adds one day for some ZIPs more than 50 miles from their regional processing plant, so a few ZIPs may be one day slower than shown. Check a specific pair at usps.com/service-standards.
Mailing day: USPS counts delivery days starting the day after your mail is accepted and skips Sundays and federal holidays. Picking a day under “Mailed on” shows the day of the week it should arrive: a 3-day letter mailed Friday arrives Tuesday. Mail dropped in a box after the last pickup, or on Sunday, is accepted the next business day. Holidays add a day and are not shown.
How often it's on time: USPS's own quarterly service performance reports, by district (Periodicals: by area). They show the share of mail delivered within the target, and within 1 and 3 extra days. Letters use the Single-Piece First-Class Mail results; Marketing Mail uses end-to-end results. USPS publishes no regional results for Priority Mail or Ground Advantage. Districts come from USPS's ZIP-to-district list.
ZIP city names: USPS ZIP Code Locale Detail (post office city for each ZIP). You can type a city name in the From / To boxes.
Fastest and slowest: for each mail class, every ZIP prefix is ranked by its average USPS delivery days to every ZIP code in the country (“mailing from”), or from every ZIP code (“receiving at”), with each ZIP code counted once. “Lower 48” leaves Alaska, Hawaii and the territories out at both ends. These are USPS targets, not measured times.
Mail plants: USPS PostalPro Facility File: Processing & Distribution Centers and Facilities (squares) and Network / Regional Distribution Centers for packages (diamonds), each placed at the middle of its ZIP code. The file is older than the delivery days and USPS has opened and merged plants since, so a few may be out of date. USPS does not publish which plant handles each ZIP, so “nearest mail plant” is the closest one as the crow flies, a good guess but not always the one your mail goes through.
City labels: Natural Earth populated places (public domain). Major cities show on the full map; more appear as you zoom in.
ZIP shapes: U.S. Census Bureau 2020 ZIP Code Tabulation Areas. They approximate ZIP codes; PO-box-only ZIPs have no shape. They only cover populated places, so land with nobody living on it (much of the North Maine Woods, national forests, deserts and military ranges) has no ZIP area and is shown hatched. Zoom in to see each three-digit ZIP prefix labelled on the map (e.g. 816xx).
Chance it arrives: for each destination ZIP, the USPS target is spread out using USPS's on-time results for that destination's district: the share delivered on time, then 1, 2 and 3 days late (anything later is counted as 4 days late). The legend averages this over every ZIP code, as if you mailed one piece to a random ZIP. It is an estimate from district averages, not a guarantee for your piece. Priority Mail and Ground Advantage have no published on-time results, so for them the legend shows the share of ZIP codes.
Map: Equal Earth projection, which keeps areas true. Alaska, Hawaii and the territories are shown in separate boxes, each at its own scale.

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