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US ZIP Code Profile

ZIP Code 01940
Lynnfield, Massachusetts

ZIP code 01940 is in Lynnfield, located in Essex County, Massachusetts, within the Boston-Cambridge-Newton metro area. Its 2020 Census population was 13,326. The estimated median adjusted gross income per tax return is $106,419, and about 29% of filers report $200,000 or more.

2020 Population
13,326
Census ZCTA
County
Essex
FIPS 25009
Median income (est.)
$106,419
IRS SOI 2022
Land Area
10.545 mi²
+ 0.659 mi² water

01Location & Geography

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

Primary CityLynnfield, MA
CountyEssex County (FIPS 25009)
StateMassachusetts (FIPS 25)
Metro Area (MSA)Boston-Cambridge-Newton, MA-NH Metro Area (14460)
Census Region / DivisionNortheast Region · New England Division
Coordinates42.534145, -71.03833
Land / Water Area10.545 mi² land · 0.659 mi² water

02Income & Economics

Distribution of the 6,690 individual tax returns filed in 01940 by adjusted gross income bracket (IRS SOI, 2022).

< $25K
19.7%
$25K–$50K
10.5%
$50K–$75K
10.0%
$75K–$100K
8.4%
$100K–$200K
22.1%
$200K+
29.3%
The $200,000+ bracket accounts for 77% of 01940's total adjusted gross income, from 29% of returns — a concentration that drives the gap between the median ($106,419) 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 01940's IRS income metrics, 2020–2022.

Median income (2021→2022)
$106,419
▲ 8.6%
Filers earning $200K+
29.3%
▲ 1.7 pt
Total filers
6,690
▼ 0.1%
GET /zipc/v2/zipcodes/01940/soi?year=… $90K 2020 $98K 2021 $106K 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 01940 ZCTA.

2000
11,542
 
2010
12,108
▲ +4.9%
2020
13,326
▲ +10.1%

05Nearby ZIP Codes — Live Radius Search

Drag the slider to filter ZIP codes by distance from 01940. Powered by the same radius endpoint developers call from the API.

GET /zipc/v2/radius

ZIP codes within range of 01940

Lynnfield and its immediate neighbors, sorted by distance.

3 mi
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Distance from 01940 to any ZIP

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06USPS Postal Details

Delivery and facility attributes from the monthly USPS dataset.

ZIP ClassificationNon-Unique Zip
Facility TypePost Office
Carrier Route SortB
USPS Finance Number244220
City AliasesLynnfield, South Lynnfield

07Frequently Asked Questions

What county is ZIP code 01940 in?

ZIP code 01940 is in Essex County, Massachusetts (county FIPS code 25009).

What city is ZIP code 01940?

The primary USPS city for 01940 is Lynnfield, MA.

What metro area (MSA) is 01940 in?

01940 is part of the Boston-Cambridge-Newton, MA-NH Metro Area (MSA code 14460).

What is the population of ZIP code 01940?

The 2020 Census population of 01940 was 13,326 residents.

What is the median income in ZIP code 01940?

Based on IRS Statistics of Income data, the estimated median adjusted gross income per tax return in 01940 is about $106,419, with around 29% of filers reporting $200,000 or more. Note that adjusted gross income is a tax measure and differs from U.S. Census household income.