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US ZIP Code Profile

ZIP Code 33813
Lakeland, Florida

ZIP code 33813 is in Lakeland, located in Polk County, Florida, within the Lakeland-Winter Haven metro area. Its 2020 Census population was 36,448. The estimated median adjusted gross income per tax return is $61,837, and about 10% of filers report $200,000 or more.

2020 Population
36,448
Census ZCTA
County
Polk
FIPS 12105
Median income (est.)
$61,837
IRS SOI 2022
Land Area
15.425 mi²
+ 1.183 mi² water

01Location & Geography

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

Primary CityLakeland, FL
CountyPolk County (FIPS 12105)
StateFlorida (FIPS 12)
Metro Area (MSA)Lakeland-Winter Haven, FL Metro Area (29460)
Census Region / DivisionSouth Region · South Atlantic Division
Coordinates27.968975, -81.935646
Land / Water Area15.425 mi² land · 1.183 mi² water

02Income & Economics

Distribution of the 17,740 individual tax returns filed in 33813 by adjusted gross income bracket (IRS SOI, 2022).

< $25K
22.8%
$25K–$50K
20.2%
$50K–$75K
14.9%
$75K–$100K
10.8%
$100K–$200K
21.2%
$200K+
10.2%
The $200,000+ bracket accounts for 49% of 33813's total adjusted gross income, from 10% of returns — a concentration that drives the gap between the median ($61,837) 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 33813's IRS income metrics, 2020–2022.

Median income (2021→2022)
$61,837
▲ 7.5%
Filers earning $200K+
10.2%
▲ 0.7 pt
Total filers
17,740
▲ 2.1%
GET /zipc/v2/zipcodes/33813/soi?year=… $53K 2020 $58K 2021 $62K 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 33813 ZCTA.

2000
35,411
 
2010
31,698
▼ -10.5%
2020
36,448
▲ +15.0%

05Nearby ZIP Codes — Live Radius Search

Drag the slider to filter ZIP codes by distance from 33813. Powered by the same radius endpoint developers call from the API.

GET /zipc/v2/radius

ZIP codes within range of 33813

Lakeland and its immediate neighbors, sorted by distance.

3 mi
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Distance from 33813 to any ZIP

Enter a 5-digit ZIP to calculate the distance.

06USPS Postal Details

Delivery and facility attributes from the monthly USPS dataset.

ZIP ClassificationNon-Unique Zip
Facility TypePost Office
Carrier Route SortD
USPS Finance Number114920
City AliasesLakeland

07Frequently Asked Questions

What county is ZIP code 33813 in?

ZIP code 33813 is in Polk County, Florida (county FIPS code 12105).

What city is ZIP code 33813?

The primary USPS city for 33813 is Lakeland, FL.

What metro area (MSA) is 33813 in?

33813 is part of the Lakeland-Winter Haven, FL Metro Area (MSA code 29460).

What is the population of ZIP code 33813?

The 2020 Census population of 33813 was 36,448 residents.

What is the median income in ZIP code 33813?

Based on IRS Statistics of Income data, the estimated median adjusted gross income per tax return in 33813 is about $61,837, with around 10% of filers reporting $200,000 or more. Note that adjusted gross income is a tax measure and differs from U.S. Census household income.