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 High-density area
- $137,615
- Median income Above-median income area
- $515,000
- Median home value Above-median home value
- 60.5%
- Bachelor's or higher Above-average bachelor's attainment
National ZIP placement
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.
FHFA HPI release change
What changed in the latest House Price Index year
- FHFA House Price Index values in ZIP 06437 (Guilford, CT) rose +10.0% from 2023 to 2024. The all-transactions index moved from 199.6 in 2023 to 219.6 in 2024 (2000 = 100).
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 average Connecticut ZIP), while per-capita income is $73,108. The poverty rate is 2.8%, with unemployment at 4.9%; those measures add context to the income figure. Housing is both higher-cost and owner-heavy: median home value is $515,000 (19% above the average Connecticut ZIP), while 83.6% of occupied homes are owner-occupied and median rent is $1,717.
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. The page also surfaces 8 ZIP codes within roughly 10 miles and 6 more in New Haven County, so 06437 can be compared with both its immediate and county-level context.
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.
- Health care and social assistance
Health care and social assistance
107 establishments
- Retail trade
Retail trade
82 establishments
- Professional, scientific, and technical services
Professional, scientific, and technical services
81 establishments
- Other services (except public administration)
Other services (except public administration)
78 establishments
- Construction
Construction
71 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, 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
Who lives in ZIP 06437?
51.2
Median Age
50.3%
Male
49.7%
Female
9.4%
Foreign-Born
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 ZIP avg
$73,108
Per Capita Income
2.8%
Poverty Rate
4.9%
Unemployment Rate
25.9 min
Mean Commute Time
How ZIP 06437 ranks among Connecticut ZIPs
Guilford, CT household income vs. every Connecticut ZIP code
Median household income among 270 reporting Connecticut ZIPs (this ZIP's population is too small for a reliable national-corpus placement)
$137,615 Top 19% higher than 81% of 270 Connecticut ZIPs
Each bar is a $20K-wide band; taller bars hold more Connecticut 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?
Source: U.S. Census Bureau, ACS 5-Year Estimates (2023)
What does housing look like?
Housing stock: occupied vs vacant
9,825housing units
9,825
Total Housing Units
8,856
Occupied Units
969
Vacant Units
2.47
Avg Household Size
Occupancy Type
$515,000
Median Home Value
+19% vs state ZIP avg
$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.
- 06492
Wallingford (06492)
45,241 residents
- 06405
Branford (06405)
27,860 residents
- 06437
Guilford (06437)
22,375 residents
- 06443
Madison (06443)
18,269 residents
- 06471 7,720
North Branford (06471)
7,720 residents
- 06422 7,388
Durham (06422)
7,388 residents
- 06472 6,853
Northford (06472)
6,853 residents
- 06419 6,525
Killingworth (06419)
6,525 residents
- 06441 5,438
Higganum (06441)
5,438 residents
What this shows Among its immediate neighbors, ZIP 06437 ranks #3 by population - useful context the national average alone can't give.
ZIP 06437 vs its nearest neighbors, by median income
Median household income of this ZIP and the closest reporting ZIP codes within ~10 miles.
- 06443
Madison (06443)
$168,462 median income
- 06422
Durham (06422)
$158,857 median income
- 06419
Killingworth (06419)
$140,655 median income
- 06437
Guilford (06437)
$137,615 median income
- 06441
Higganum (06441)
$111,250 median income
- 06471
North Branford (06471)
$109,388 median income
- 06472
Northford (06472)
$105,729 median income
- 06405
Branford (06405)
$105,225 median income
- 06492
Wallingford (06492)
$105,061 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.
| 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 |
Nationwide ZIPs with similar ACS profiles
Two Census-derived peer sets for ZIP 06437, both outside CT so the neighborhoods are not geographic containment (Nearby and same-county blocks stay local).
Similar population
Nearest cross-state ZIPs by resident population (22,375 here; floor ≥1,000).
Similar median household income
Nearest cross-state ZIPs by ACS median household income.
More ZIP Codes in New Haven County
Related Areas
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.
Related
Take this with you
What to do with ZIP 06437's numbers, next.
- See how ZIP 06437 compares to a neighboring ZIP code on the same Census fields Compare this ZIP
- Check where Guilford, CT ranks among every U.S. ZIP code on income, education, or homeownership View national rankings
- Save this ZIP to your shortlist to track alongside others you're considering View your shortlist
ZIP Code Tabulation Areas (ZCTAs) are Census Bureau approximations of USPS ZIP codes; figures describe the ZCTA area, not any single address within it.