What city is 33037 in?

33037 is a Key Largo, FL mailing address. By land area, 56% lies inside North Key Largo and 36% lies inside Key Largo; the rest is outside any Census-defined city or community.

What is the population of 33037?

About 14,770 people (±893), according to the Census Bureau's American Community Survey 5-year estimates for 2020–2024. The 2020 Census counted 13,875.

What is the median household income in 33037?

$86,533 (±$5,602), compared with $74,568 for Florida as a whole. Half the households in the ZIP code earn more and half earn less.

How many carrier routes and mailboxes are in 33037?

17 USPS carrier routes with 8,794 residential and 567 business mailboxes (9,361 in all), from the route data stored by EDDM2GO. An EDDM mailing can target any combination of these routes.

What ZIP codes are near 33037?

The closest, measured center to center: 33035 (13.6 mi, Homestead), 33070 (16.5 mi, Tavernier), 33033 (17.5 mi, Homestead), 33039 (18.8 mi, Homestead Base), 33030 (18.9 mi, Homestead) and 33032 (21.1 mi, Princeton).

33037 ZIP Code, Key Largo, FL

33037 is a ZIP code in Key Largo, Florida in Monroe County. It covers 33 square miles of land. The closest ZIP codes are 33035, 33070 and 33033. 14,770 people live here in 6,083 households. With about 449 people per square mile it is lightly settled, and most homes are owner-occupied (79%). Median household income is $86,533, above the Florida median of $74,568; the median age is 53.2, older than most ZIP codes.

Quick facts

Mailing city: Key Largo, FL
County: Monroe County
Land area: 33 sq mi
Population: 14,770
Median household income: $86,533
Carrier routes: 17 (8,794 homes)

Key figures

Measure	Value
Residents	14,770
Households	6,083
Median household income	$86,533
Income per person	$64,917
Median age	53.2
Homeowners	79.2%
Median home value	$683,000
Median rent	$1,899
Bachelor's degree or higher	41.7%
Average commute (minutes)	25.8
Households with kids under 18	18.2%
Moved in the past year	10.3%
Below the poverty line	12.0%
Broadband internet	88.4%
Speak a non-English language at home	24.1%

Household income

% of households	Value
<$10K	5.2%
$10–15K	3.5%
$15–25K	6.2%
$25–35K	4.8%
$35–50K	7.1%
$50–75K	17.3%
$75–100K	12.1%
$100–150K	14.0%
$150–200K	11.2%
$200K+	18.6%

Age

% of all residents	Value
<10	4.9%
10–19	10.8%
20–24	4.5%
25–34	8.7%
35–44	11.3%
45–54	13.5%
55–64	15.2%
65–74	15.6%
75+	15.5%

Tenure

% of housing units	Value
Owned, with mortgage	16.8%
Owned outright	28.9%
Rented	11.9%
Vacant	42.4%

Type of building

% of housing units	Value
Detached house	61.6%
Townhome	3.8%
2–4 units	9.4%
5–19 units	7.1%
20+ units	4.7%
Mobile / other	13.5%

Businesses in 33037

689 business establishments with 6,908 employees (ZIP Codes Business Patterns 2023).

Retail Trade: 100
Real Estate and Rental and Leasing: 90
Accommodation and Food Services: 90
Construction: 82
Professional, Scientific, and Technical Services: 80
Other Services (except Public Administration): 60
Health Care and Social Assistance: 41
Administrative and Support and Waste Management and Remediation Services: 32

EDDM carrier routes

33037 has 17 USPS carrier routes with 8,794 residential and 567 business mailboxes. Open the EDDM route map.

Carrier routes in 33037

33037 has 17 USPS carrier routes (17 rural (R)) with 8,794 residential and 567 business mailboxes. Routes range from 126 homes (R016) to 758 homes (R002); the median route has 560 homes. The Census counted 6,083 households in 33037 (2020–2024 average); USPS counts current mailboxes, including new and vacant homes.

Homes per route	Routes
1–249	1
250–499	7
500–749	8
750–999	1
1,000–1,499	0
1,500+	0

Best routes in 33037 for…

Most businesses

For B2B offers: office supplies, cleaning, IT, catering and commercial services.

Route R300 — USPS business mailboxes 123, 336 homes
Route R012 — USPS business mailboxes 70, 560 homes
Route R008 — USPS business mailboxes 68, 659 homes
Route R014 — USPS business mailboxes 65, 438 homes
Route R001 — USPS business mailboxes 40, 367 homes

Select these 5 routes on the route map

Every carrier route in 33037

Route	Type	Homes	Businesses	Est. median income	Est. owners	Est. families with kids	Est. moved in past year
R001	Rural	367	40	$100,420	—	—	—
R002	Rural	758	33	$72,457	—	—	—
R003	Rural	620	0	$77,673	—	—	—
R004	Rural	658	13	$55,929	—	—	—
R005	Rural	569	9	$100,420	—	—	—
R006	Rural	495	9	$78,179	—	—	—
R007	Rural	457	27	$112,795	—	—	—
R008	Rural	659	68	$72,457	—	—	—
R009	Rural	436	21	$112,795	—	—	—
R010	Rural	625	19	$80,455	—	—	—
R011	Rural	706	7	$72,228	—	—	—
R012	Rural	560	70	$72,228	—	—	—
R013	Rural	605	28	$56,212	—	—	—
R014	Rural	438	65	$80,455	—	—	—
R015	Rural	379	31	$72,457	—	—	—
R016	Rural	126	4	$112,795	—	—	—
R300	Rural	336	123	$100,420	—	—	—

Income, owners, families and movers are estimates for each route (how we estimate them); mailbox counts are current USPS figures. Open 33037 on the EDDM route map.

How route demographics are estimated

Mailbox counts come from USPS; demographics are estimates

The number of homes and businesses on each carrier route is the current USPS EDDM count. The Census Bureau does not publish figures for carrier routes, so income, homeownership, ages, families, movers and housing age on a route are EDDM2GO estimates built from Census block groups (neighborhood areas of roughly 600 to 3,000 people).

How a route gets its figures: the block-group length-share method

We trace each route's streets every 25 meters and record which block group each stretch falls in. The route's homes are spread along its streets in proportion to length, so a route with 60% of its street length in one block group is assumed to have 60% of its homes there. Each block group then contributes its Census counts in proportion to the share of its housing units that sit on the route (capped at the whole block group). Medians are recalculated from the combined income, home-value and age brackets, the way the Census Bureau computes them, not averaged.

Margins of error

Census survey figures carry a margin of error at 90% confidence; we carry it through the calculation and show it as ±. Our margins treat the route-to-block-group split as exact, so the real uncertainty is larger. Routes with fewer than 100 estimated households, large margins, or streets we could not place are flagged.

Different years

USPS mailbox counts are current. Census figures are 5-year averages for 2020–2024, so a new subdivision may have more homes on the route today than the Census counted. Use the route figures to compare routes with each other, not as an exact head count.

Why some routes show identical figures

Two routes that run through the same block group get the same percentages and medians, because the Census publishes one set of figures for the whole block group. Their mailbox counts still differ, and those are exact.

Route and mailbox counts: USPS EDDM route data. Route demographics: EDDM2GO estimates from U.S. Census Bureau American Community Survey 5-year block-group data (2020–2024) and 2024 cartographic block-group boundaries. This product uses the Census Bureau Data API but is not endorsed or certified by the Census Bureau.

Nearby ZIP codes

33035 — Homestead city, FL (13.6 mi)
33070 — Tavernier CDP, FL (16.5 mi)
33033 — Homestead city, FL (17.5 mi)
33039 — Homestead Base CDP, FL (18.8 mi)
33030 — Homestead city, FL (18.9 mi)
33032 — Princeton CDP, FL (21.1 mi)
33031 (21.4 mi)
33170 — Goulds CDP, FL (23.1 mi)

Areas that include 33037

Key Largo, FL ZIP codes — 1 ZIP code
North Key Largo, FL ZIP codes — 1 ZIP code
Monroe County ZIP codes — 11 ZIP codes
Florida ZIP code data

Where it ranks

Mail every home in 33037

Route counts on this page price as Full Service 6.5 × 9 postcards: we print, bundle by carrier route and hand the mailing to USPS. Prefer to take it to the Post Office yourself? Print only costs less and you pay postage at drop-off.

EDDM guides

ZIP code statistics describe the Census ZIP Code Tabulation Area (ZCTA) 33037, which approximates the USPS ZIP code area. Census figures: American Community Survey 5-year estimates, 2020–2024.

Frequently asked questions

What city is 33037 in?: 33037 is a Key Largo, FL mailing address. By land area, 56% lies inside North Key Largo and 36% lies inside Key Largo; the rest is outside any Census-defined city or community.
What county is 33037 in?: 33037 is in Monroe County.
What is the population of 33037?: About 14,770 people (±893), according to the Census Bureau's American Community Survey 5-year estimates for 2020–2024. The 2020 Census counted 13,875.
What is the median household income in 33037?: $86,533 (±$5,602), compared with $74,568 for Florida as a whole. Half the households in the ZIP code earn more and half earn less.
How many carrier routes and mailboxes are in 33037?: 17 USPS carrier routes with 8,794 residential and 567 business mailboxes (9,361 in all), from the route data stored by EDDM2GO. An EDDM mailing can target any combination of these routes.
What ZIP codes are near 33037?: The closest, measured center to center: 33035 (13.6 mi, Homestead), 33070 (16.5 mi, Tavernier), 33033 (17.5 mi, Homestead), 33039 (18.8 mi, Homestead Base), 33030 (18.9 mi, Homestead) and 33032 (21.1 mi, Princeton).

This product uses the Census Bureau Data API but is not endorsed or certified by the Census Bureau.