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US ZIP Code Profile

ZIP Code 33037
Key Largo, Florida

ZIP code 33037 is in Key Largo, located in Monroe County, Florida, within the Key West metro area. Its 2020 Census population was 13,875. The estimated median adjusted gross income per tax return is $57,797, and about 17% of filers report $200,000 or more.

2020 Population
13,875
Census ZCTA
County
Monroe
FIPS 12087
Median income (est.)
$57,797
IRS SOI 2022
Land Area
33.813 mi²
+ 87.351 mi² water

01Location & Geography

Authoritative geographic identifiers from the U.S. Census Bureau, ANSI, and FIPS standards.

Primary CityKey Largo, FL
CountyMonroe County (FIPS 12087)
StateFlorida (FIPS 12)
Metro Area (MSA)Key West, FL Micro Area (28580)
Census Region / DivisionSouth Region · South Atlantic Division
Coordinates25.225842, -80.41434
Land / Water Area33.813 mi² land · 87.351 mi² water

02Income & Economics

Distribution of the 7,670 individual tax returns filed in 33037 by adjusted gross income bracket (IRS SOI, 2022).

< $25K
25.6%
$25K–$50K
20.3%
$50K–$75K
13.2%
$75K–$100K
7.8%
$100K–$200K
15.7%
$200K+
17.5%
The $200,000+ bracket accounts for 90% of 33037's total adjusted gross income, from 17% of returns — a concentration that drives the gap between the median ($57,797) and the average.
Estimated median = median adjusted gross income per tax return, interpolated from IRS SOI brackets. Differs from U.S. Census household income.

03Income Over Time

Year-over-year change in 33037's IRS income metrics, 2020–2022.

Median income (2021→2022)
$57,797
▲ 5.1%
Filers earning $200K+
17.5%
▲ 1.0 pt
Total filers
7,670
▲ 5.2%
GET /zipc/v2/zipcodes/33037/soi?year=… $46K 2020 $55K 2021 $58K 2022
Median = adjusted gross income per return, interpolated from IRS SOI brackets. Figures are nominal (not inflation-adjusted).

04Population Trend

Decennial U.S. Census population for the 33037 ZCTA.

2000
12,971
 
2010
11,612
▼ -10.5%
2020
13,875
▲ +19.5%

05USPS Postal Details

Delivery and facility attributes from the monthly USPS dataset.

ZIP ClassificationNon-Unique Zip
Facility TypePost Office
Carrier Route SortD
USPS Finance Number114585
City AliasesCross Key, Key Largo, Ocean Reef Club, Upper Key Largo

06Frequently Asked Questions

What county is ZIP code 33037 in?

ZIP code 33037 is in Monroe County, Florida (county FIPS code 12087).

What city is ZIP code 33037?

The primary USPS city for 33037 is Key Largo, FL.

What metro area (MSA) is 33037 in?

33037 is part of the Key West, FL Micro Area (MSA code 28580).

What is the population of ZIP code 33037?

The 2020 Census population of 33037 was 13,875 residents.

What is the median income in ZIP code 33037?

Based on IRS Statistics of Income data, the estimated median adjusted gross income per tax return in 33037 is about $57,797, with around 17% of filers reporting $200,000 or more. Note that adjusted gross income is a tax measure and differs from U.S. Census household income.