ZIP code 81138: Costilla County, CO
ZIP code 81138 is in Costilla County, Colorado, outside any city or Census-designated place. It is in Colorado's 3rd congressional district. Its state senate district is State Senate District 6; its state house district is State House District 62.
See it on the mapAll of Colorado
City and county
Outside any city or Census-designated place.
| County | Share of ZIP residents |
|---|---|
| Costilla County | 100% |
| Town or county subdivision | Share of ZIP residents |
|---|---|
| San Luis CCD | 100% |
Congressional district
| Congressional district | Share of ZIP residents |
|---|---|
| Colorado's 3rd congressional district (CO-03) | 100% |
Elected officials
| Office | Member | Contact | Share of residents |
|---|---|---|---|
| U.S. Representative (CO-03) | Jeff Hurd (R) | 202-225-4676 | 100% |
| U.S. Senator | John W. Hickenlooper (D) | 202-224-5941 · contact form | statewide |
| U.S. Senator | Michael F. Bennet (D) | 202-224-5852 · contact form | statewide |
| State Senator (State Senate District 6) | Cleave Simpson (R) | 100% | |
| State Representative (State House District 62) | Matt Martinez (Democratic) | 100% |
Officials serving now (members of Congress until January 3, 2027). Sources: State legislators: Open States (public domain); Members of Congress: the @unitedstates project, congress-legislators (CC0).
Local government
- Costilla County website: http://www.costillacounty-co.gov
- Costilla County laws: search for the Costilla County, Colorado code of ordinances
State legislative districts
| State senate district | Share of ZIP residents |
|---|---|
| State Senate District 6 | 100% |
| State house district | Share of ZIP residents |
|---|---|
| State House District 62 | 100% |
Voting precincts
1 voting precinct overlap ZIP 81138. Map them, with each precinct's share of the ZIP's residents.
Get this in your AI agent
Your agent can get these cities, counties, districts and precincts with their shares, and their GeoJSON boundaries, from Boundary Atlas. Add https://atlas-production-d344.up.railway.app/mcp to Claude, ChatGPT, Cursor or Codex (free, no key; how), then:
related_geographies(id="us:zcta:81138")
ZIP 81138 here is the Census Bureau's ZIP Code Tabulation Area, which approximates the USPS ZIP Code; PO-box-only ZIPs have none. Districts are the maps in force for the November 3, 2026 election.