Zip-Codes.com MCP: address checks and ZIP Code data in your AI app

Add Zip-Codes.com to Claude, ChatGPT or Cursor

1. 1Click Connect Zip-Codes.com free. There's no sign-in, so its tools are ready at once.
2. 2Eleven tools look things up. The twelfth, `buy_credits`, buys a credit pack with a wallet that pays MPP challenges, so switch it off unless you want your AI app spending money.
3. 3Add ContextGate to your AI app as a connector or MCP server. The steps for each app are on the Works with page.
4. 4Ask your AI app to validate a US street address and return its ZIP+4, then open Activity to see the `validate_address` call.

Address and ZIP Code lookups from Claude or ChatGPT

• Validate and standardize a US street address with `validate_address` and get its ZIP+4.
• Get the full record for a US ZIP Code or Canadian postal code with `zip_lookup`.
• Find every ZIP Code within a radius of a point with `radius_search`, or the distance and bearing between two places with `distance`.
• Check how USPS names a ZIP Code and which city names are allowed on mail with `city_name_rules`.

Spending and source data under control

• Switch off `buy_credits`, and your AI app can't buy credits; the tool is hidden and refused if called.
• Set a policy to warn before customer addresses are sent for validation.
• Activity records each lookup, and `about_data` tells you which dataset and edition the answers come from.

What you get with Zip-Codes.com and ContextGate

• Your AI apps can use Zip-Codes.comClaude, Cursor, ChatGPT and other AI apps reach Zip-Codes.com through the one ContextGate connection you add to them.
• You choose which tools they can useSwitch off any Zip-Codes.com tool you don't want used. It's hidden from your AI apps and refused if called.
• Every call is checked and recordedYour policies check each call (for example, personal data is hidden and secrets are blocked), and Activity keeps a record of it.

ContextGate sees only the tool calls that go through it, not your AI app's built-in tools or your chats.

Zip-Codes.com tools

Examples of what your AI apps can do in Zip-Codes.com. You'll see the exact list of tools after you connect it.

• suggest_placesSearch for a place by partial name, misspelled name, or partial code — the resolver that turns what a person typed into something the other tools can look up. F
• zip_lookupThe full record for a postal code — the main location-intelligence tool. Takes a US ZIP Code, a US ZIP+4, a Canadian FSA, a Canadian postal code, or a latitude,
• zip_factsStatistics about US ZIP Codes and Canadian postal codes: how many exist, how they break down by type, delivery point and carrier route totals, per-state tables,
• quick_zipThe fast, small answer for a postal code. Takes a US ZIP Code, a US ZIP+4, a Canadian FSA, a Canadian postal code, or a latitude,longitude pair, and returns the
• city_name_rulesHow USPS names a ZIP Code, and which of those names may be used on mail. Each ZIP Code has exactly one preferred city name plus alternates, and some alternates
• buy_creditsBuy a credit pack with a wallet that pays MPP (Machine Payments Protocol) challenges, such as Stripe Link. The credits go on the account or prepaid card of the
• radius_searchFind every US ZIP Code and Canadian postal area within a radius of a centre point, with the distance to each. The centre takes a US ZIP Code, a US ZIP+4, a Cana
• about_dataWhere this server's data comes from: for each dataset the authority behind it, the edition served where the source publishes editions (TIGER/Line, ACS, ZCTA), h
• distanceDistance between two places, in miles and kilometres, plus the compass bearing from the first to the second. Each end takes a US ZIP Code, a US ZIP+4, a Canadia
• validate_addressValidate and standardise a US street address and return its ZIP+4. US ONLY — unlike the postal-code tools, this does not cover Canada. Send the address on one l
• county_referenceUS counties and county equivalents — all 3,235 of them — with their Census and USPS names, which disagree for over a hundred, plus ANSI code, legal type, land a
• metro_area_referenceUS metropolitan and micropolitan statistical areas (CBSAs) — all 935. Of those only 393 are metropolitan; the rest are micropolitan and are NOT metro areas, so