PlainZIP

Guilford, CT · standard

ZIP Code 06437

New Haven County, Connecticut - Census ACS demographics, housing tenure, and business patterns, benchmarked against every US ZIP.

22,375
184/sq mi
$137,615
Median income
$515,000
Median home value
60.5%
Bachelor's or higher

The verdict

Guilford pairs a top-decile household income with upper-quartile home values, in a rural, homeowner-dominated area.

Top 5%
household income, US ZIPs
Top 12%
home value, US ZIPs
184
people per sq mi
84%
owner-occupied homes

Source: U.S. Census Bureau ACS 5-Year Estimates (2019–2023). Percentiles rank ZIP 06437 against every reporting US ZIP.

ZIP code 06437 is a densely settled ZIP (a standard USPS delivery area) in Guilford, New Haven County, Connecticut, with 22,375 residents across 121.9 square miles, a density of 184 people per square mile, in the New York time zone.

ZIP 06437 skews affluent, with a median household income of $137,615 (22% above the Connecticut average), while per-capita income is $73,108. Local economic indicators show a 2.8% poverty rate alongside 4.9% unemployment. The typical home here is valued at $515,000 (19% above the state average); renters pay a median of $1,717 monthly, and 83.6% of units are owner-occupied.

This is a highly-educated ZIP: 60.5% of adults hold a bachelor's degree or higher, the median age is 51.2, and the average commute is 26 minutes. A geography-based comparison follows: 8 ZIP codes within about 10 miles of 06437, plus 6 more within New Haven County, give a clearer read than the national average alone.

Every figure on this page is sourced from the U.S. Census Bureau American Community Survey 5-Year Estimates (including median rent) and the FHFA House Price Index, no estimates, no proprietary scoring. Verify with Census →

Top industries in ZIP 06437

Top 5 sectors by establishment count in Guilford, CT

Which industries have the most business establishments in ZIP 06437.

establishments

What this shows Establishment counts come from the Census ZIP Code Business Patterns program, which counts physical business locations rather than employees or revenue.

Source U.S. Census Bureau · ZIP Code Business Patterns (ZBP) As of 2023

Source: U.S. Census Bureau, American Community Survey 5-Year Estimates + ZIP Code Business Patterns + FHFA HPI ACS demographics and median rent, ZBP business establishments, FHFA HPI for ZIP 06437, Guilford, CT · 2023 Census ACS 5-Year Estimates use a rolling 60-month sample for stable small-geography estimates; ZBP updated annually; FHFA HPI updated quarterly/annually.

Quick Facts

22,375

Population

121.9

Area (sq mi)

184

People / sq mi

New York

Time Zone

standard

ZIP Type

Neighborhood Scorecard
Get an A-F grade across income, safety, housing, rent, education, commute, and childcare for this ZIP code.
View Scorecard →

Who lives in ZIP 06437?

51.2

Median Age

50.3%

Male

49.7%

Female

9.4%

Foreign-Born

White 84.6%
African American 1.6%
Asian 4.5%
American Indian or Alaska Native 0.0%
Native Hawaiian or Pacific Islander 0.0%
Two or More Ethnicities 7.8%
Hispanic or Latino 5.8%

Hispanic or Latino is an ethnicity category from the Census Bureau and may overlap with other categories above.

Source: U.S. Census Bureau, ACS 5-Year Estimates (2023)

How much do residents earn?

$137,615

Median Household Income

+22% vs state

$73,108

Per Capita Income

2.8%

Poverty Rate

4.9%

Unemployment Rate

25.9 min

Mean Commute Time

How ZIP 06437 ranks nationally

Guilford, CT household income vs. every US ZIP code

Median household income, the full national distribution, with this ZIP marked

$137,615 Top 5% higher than 95% of 30,318 US ZIPs

$0–$20,000: 118 US ZIPs (0%). Below this entry. $20,000–$40,000: 1,573 US ZIPs (5%). Below this entry. $40,000–$60,000: 7,092 US ZIPs (23%). Below this entry. $60,000–$80,000: 9,980 US ZIPs (33%). Below this entry. $80,000–$100,000: 5,778 US ZIPs (19%). Below this entry. $100,000–$120,000: 2,855 US ZIPs (9%). Below this entry. $120,000–$140,000: 1,362 US ZIPs (4%). This entry sits in this band. $140,000–$160,000: 686 US ZIPs (2%). Above this entry. $160,000–$180,000: 364 US ZIPs (1%). Above this entry. $180,000–$200,000: 186 US ZIPs (1%). Above this entry. $200,000–$220,000: 324 US ZIPs (1%). Above this entry. This ZIP $0 $200K+ every reporting US ZIP, bucketed by value

Each bar is a $20K-wide band; taller bars hold more US ZIPs. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count, share, and where it sits relative to this entry.

Source U.S. Census Bureau, ACS 5-Year Estimates · 2019–2023

Source: U.S. Census Bureau, ACS 5-Year Estimates (2023)

What is the education profile here?

High School Graduate or Higher 77.4%
Bachelor's Degree or Higher 60.5%

Source: U.S. Census Bureau, ACS 5-Year Estimates (2023)

What does housing look like?

9,825

Total Housing Units

8,856

Occupied Units

969

Vacant Units

2.47

Avg Household Size

Occupancy Type

Owner 83.6%
Renter 16.4%

$515,000

Median Home Value

+19% vs state

$1,717

Median Rent

1974

Median Year Built

Source: U.S. Census Bureau, ACS 5-Year Estimates (2023)

How have home values changed over time?

FHFA House Price Index, annual appreciation data based on repeat sales and appraisals

+10.0%

YoY Change (2024)

220

HPI Index (2000 = 100)

+120%

Total Change Since 2000

Home values in ZIP 06437 have increased 10.0% over the past year (2024). Since 2000, this ZIP has seen +120% cumulative appreciation.

Year Annual Change HPI Index
2020 +3.3% 148
2021 +9.9% 163
2022 +14.4% 187
2023 +7.0% 200
2024 +10.0% 220

Source: Federal Housing Finance Agency (FHFA) House Price Index, All-Transactions, Five-Digit ZIP Codes (Developmental Index). Index base = 100 in year 2000. Data through 2024. ZIP codes with few transactions may show missing values.

What businesses operate in this ZIP?

Census Bureau data shows 669 business establishments in ZIP 06437, employing approximately 8,094 people with a combined annual payroll of $614,889,000.

669

Businesses

8,094

Employees

$614.9M

Annual Payroll

16

Industry Sectors

Industry Establishments % of Total
Health care and social assistance 107 16.0%
Retail trade 82 12.3%
Professional, scientific, and technical services 81 12.1%
Other services (except public administration) 78 11.7%
Construction 71 10.6%
Finance and insurance 46 6.9%
Accommodation and food services 46 6.9%
Administrative and support and waste management and remediation services 35 5.2%
Wholesale trade 29 4.3%
Real estate and rental and leasing 19 2.8%
Arts, entertainment, and recreation 18 2.7%
Educational services 16 2.4%
Manufacturing 15 2.2%
Information 12 1.8%
Transportation and warehousing 11 1.6%
Management of companies and enterprises 3 0.5%

Source: U.S. Census Bureau, ZIP Code Business Patterns (ZBP), 2023. Employment figures may include noise for disclosure avoidance.

Nearby ZIP Codes

Want a side-by-side? Compare 06437 vs 06443 →

ZIP 06437 vs its nearest neighbors, by population

Resident population of this ZIP and the closest reporting ZIP codes within ~10 miles.

residents

What this shows Among its immediate neighbors, ZIP 06437 ranks #3 by population - useful context the national average alone can't give.

Source U.S. Census Bureau · ACS 5-Year Estimates As of 2019–2023

ZIP 06437 vs its nearest neighbors, by median income

Median household income of this ZIP and the closest reporting ZIP codes within ~10 miles.

median income

What this shows By household income, ZIP 06437 ranks #4 of 9 neighboring ZIPs, local affluence varies block to block, not just metro to metro.

Source U.S. Census Bureau · ACS 5-Year Estimates As of 2019–2023
ZIP Code City Population Distance
06443 Madison, CT 18,269 3.8 mi
06471 North Branford, CT 7,720 3.9 mi
06472 Northford, CT 6,853 5.2 mi
06422 Durham, CT 7,388 8.9 mi
06405 Branford, CT 27,860 6.2 mi
06419 Killingworth, CT 6,525 7.0 mi
06492 Wallingford, CT 45,241 10.2 mi
06441 Higganum, CT 5,438 11.0 mi

More ZIP Codes in New Haven County

06516 standard
West Haven, CT
Pop: 55,564
06511 standard
New Haven, CT
Pop: 53,600
06492 standard
Wallingford, CT
Pop: 45,241
06513 standard
New Haven, CT
Pop: 38,978
06460 standard
Milford, CT
Pop: 38,207
06450 standard
Meriden, CT
Pop: 36,493

Related Areas

New Haven County Guilford, CT Connecticut

Frequently Asked Questions

What county is ZIP code 06437 in? ▼
ZIP code 06437 (Guilford) is located in New Haven County, Connecticut. New Haven County contains multiple ZIP codes, see the full list at /counties/new-haven-ct.
What is the population of ZIP code 06437? ▼
ZIP code 06437 in Guilford, CT has a population of 22,375 according to the Census Bureau ACS 2023 estimates.
What is the median household income in ZIP 06437? ▼
The median household income in ZIP 06437 is $137,615, which is 80% above the national average of $76,288.
What is the average home value in ZIP 06437? ▼
The median home value in ZIP 06437 is $515,000, which is 85% above the national average of $278,155.
What is the demographic makeup of ZIP 06437? ▼
The largest racial group in ZIP 06437 is White at 84.6%. Hispanic or Latino residents make up 5.8% of the population.
How many businesses are in ZIP code 06437? ▼
ZIP code 06437 has 669 business establishments employing approximately 8,094 people, according to Census Bureau ZIP Code Business Patterns (ZBP) 2023 data.
What are the main industries in ZIP code 06437? ▼
The top industries by establishment count in ZIP 06437 are: Health care and social assistance (107), Retail trade (82), Professional, scientific, and technical services (81). There are 16 industry sectors represented in total.
How have home values changed in ZIP code 06437? ▼
According to the FHFA House Price Index, home values in ZIP 06437 increased by 10.0% in 2024. Since 2000, home values in this ZIP have appreciated by approximately 120%. This is a developmental index based on repeat sales and appraisal data from Fannie Mae and Freddie Mac.
What is the education level in ZIP code 06437? ▼
In ZIP code 06437, 77.4% of residents aged 25+ have a high school diploma or higher, and 60.5% hold a bachelor's degree or higher. These figures come from the Census Bureau ACS 5-Year Estimates (2023).
What is the average commute time in ZIP 06437? ▼
The mean commute time for workers in ZIP code 06437 is 25.9 minutes according to Census ACS data. The national average is roughly 26 minutes, so commuters here spend less time traveling to work than typical.
What percentage of residents own vs. rent in ZIP 06437? ▼
In ZIP code 06437, approximately 83.6% of occupied housing units are owner-occupied and 16.4% are renter-occupied, based on Census ACS 2023 data.
What is the poverty rate in ZIP code 06437? ▼
The poverty rate in ZIP code 06437 is 2.8% according to Census Bureau ACS 2023 estimates. This measures the percentage of the population living below the federal poverty threshold.

Read our methodology to see how this data is sourced, computed, and verified.