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County ZIP codes · Florida · FIPS 12087

Monroe County, FL ZIP Codes

Monroe County, Florida has 14 ZIP codes (Census 2020 ZCTA-county file; GeoNames postal codes, October 2026): 11 residential and 3 for PO boxes or a single organization. 9 of the residential ones lie mainly in Monroe County and 2 mainly in a neighboring county; 2 cross the county line. Median household income ranges from $47,170 in 33034 (Homestead) to $103,041 in 33042 (Summerland Key) (Census Bureau, ACS 2020-2024).

  • ACS2020-24
  • Census2020

Where are the ZIP codes of Monroe County?

33001 · Long Key: –33034 · Homestead: $47k33036 · Islamorada: $86k33037 · Key Largo: $87k33040 · Key West: $87k33042 · Summerland Key: $103k33043 · Big Pine Key: $111k33050 · Marathon: $95k33051 · Key Colony Beach: $94k33070 · Tavernier: $75k34141 · Ochopee: $107k330343414133040330373304233043330363305033001 · Long Key: –33034 · Homestead: $47k33036 · Islamorada: $86k33037 · Key Largo: $87k33040 · Key West: $87k33042 · Summerland Key: $103k33043 · Big Pine Key: $111k33050 · Marathon: $95k33051 · Key Colony Beach: $94k33070 · Tavernier: $75k34141 · Ochopee: $107k3303434141330403303733042330363305033001 · Long Key: –33034 · Homestead: $47k33036 · Islamorada: $86k33037 · Key Largo: $87k33040 · Key West: $87k33042 · Summerland Key: $103k33043 · Big Pine Key: $111k33050 · Marathon: $95k33051 · Key Colony Beach: $94k33070 · Tavernier: $75k34141 · Ochopee: $107k3303434141
The residential ZIP codes of Monroe 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).

How different are its ZIP codes?

The middle half of its ranked ZIP codes (1,000+ people living in households) report median household incomes between $86,032 and $86,586.

They carry 11 postal town names.

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

All 11 residential ZIP codes in Monroe County

9 ZIP codes lie mainly in Monroe County; 2 more reach into it from a neighboring county and follow the first table.

Residential ZIP codes mainly in Monroe County, largest first; "In this county" is the share of the ZIP's land in the county
In this county
33040 Key West 35,429 1,999 $87k $819k 100%
33037 Key Largo 14,770 449 $87k $683k 100%
33050 Marathon 10,561 1,163 $95k $747k 100%
33042 Summerland Key 6,441 233 $103k $857k 100%
33070 Tavernier 5,768 1,363 $75k $733k 100%
33043 Big Pine Key 4,298 258 $111k $638k 100%
33036 Islamorada 3,777 646 $86k $1.02M 100%
33051 Key Colony Beach 511 1,164 $94k $920k 100%
33001 Long Key 250 128 – $703k 100%

Partly in Monroe County

Residential ZIP codes mainly in another county that reach at least 1% into Monroe County, by their share here
In this county
33034 Homestead 23,823 20 $47k $339k 47%
34141 Ochopee 169 0 $107k – 20%

Download the 14 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?

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

Share of each ZIP code's land in Monroe County and in the neighboring counties
ZIPIn MonroeElsewhere
3303447%Miami-Dade County53%
3414120%Collier County75%; Miami-Dade County5%

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

PO Box and single-organization ZIP codes

ZIP codes in Monroe County without a residential area (GeoNames postal codes)
ZIPPostal name
33041Key West
33045Key West
33052Marathon Shores

Source: GeoNames postal codes (CC BY 4.0).

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

The first three digits of a ZIP code name the sectional center, the mail processing plant that sorts it. Monroe County's ZIP codes use 2 prefixes: 330 and 341.

Three-digit prefixes of Monroe 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 Monroe County's
PrefixSectional centerHereAll codes
330Miami, FL (SCF 331)1371
341Fort Myers, FL (SCF 339)130

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