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County ZIP codes · Kentucky · FIPS 21221

Trigg County, KY ZIP Codes

Trigg County, Kentucky has 4 ZIP codes (Census 2020 ZCTA-county file; GeoNames postal codes, October 2026), all residential. 1 of the residential ones lie mainly in Trigg County and 3 mainly in a neighboring county; 3 cross the county line.

  • ACS2020-24
  • Census2020

Where are the ZIP codes of Trigg County?

42211 · Cadiz: $60k42215 · Cerulean: $83k42232 · Gracey: $90k42236 · Herndon: $69k4221142215422364223242211 · Cadiz: $60k42215 · Cerulean: $83k42232 · Gracey: $90k42236 · Herndon: $69k4221142215422364223242211 · Cadiz: $60k42215 · Cerulean: $83k42232 · Gracey: $90k42236 · Herndon: $69k42211422154223642232
The residential ZIP codes of Trigg County (whole outlines, including the parts in neighboring counties), shaded by median household income in national fifths (ACS 2020-2024). <$54.1k$98.1k+no figure

Source: U.S. Census Bureau, 2020 ZCTA cartographic boundaries; ACS 2020-2024 5-year estimates (B19013).

All 4 residential ZIP codes in Trigg County

1 ZIP code lies mainly in Trigg County; 3 more reach into it from a neighboring county and follow the first table.

Residential ZIP codes mainly in Trigg County, largest first; "In this county" is the share of the ZIP's land in the county
In this county
42211 Cadiz 13,475 47 $60k $210k 100%

Partly in Trigg County

Residential ZIP codes mainly in another county that reach at least 1% into Trigg County, by their share here
In this county
42232 Gracey 711 32 $90k $227k 27%
42215 Cerulean 1,319 23 $83k $201k 27%
42236 Herndon 931 15 $69k $118k 7%

Download the 4 ZIP codes as CSV

Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates; county shares by land area (Census 2020 ZCTA-county relationship file).

Which ZIP codes cross the county line?

3 ZIP codes of Trigg County extend into another county. A ZIP code follows mail routes, not county borders.

Share of each ZIP code's land in Trigg County and in the neighboring counties
ZIPIn TriggElsewhere
4221527%Christian County 73%
422367%Christian County 93%
4223227%Christian County 73%

Source: U.S. Census Bureau, 2020 ZCTA-county relationship file (shares of land area).

Which first three digits do Trigg County's ZIP codes use?

The first three digits of a ZIP code name the sectional center, the mail processing plant that sorts it. Every ZIP code of Trigg County starts with 422.

Three-digit prefixes of Trigg County's ZIP codes, the sectional center for each (USPS labeling list L005, effective October 1, 2026) and how many of the prefix's codes are Trigg County's
PrefixSectional centerHereAll codes
422 Nashville, TN (SCF 370) 4 36

Source: U.S. Postal Service, labeling list L005 (3-digit ZIP Code prefix groups, SCF sortation), effective October 1, 2026.