Zip Code 06851 — Norwalk, CT

ZIP Code 06851 is associated with Norwalk, CT, in Western Connecticut County. The listed population estimate is 27,865; estimated density is 1,399.7 people per square mile. Among records with population estimates, it ranks #5 of 34 in Western Connecticut County and #38 of 285 in CT.
Page generated: 2026-10-08. This is not the source data release date.

📍 View location on OpenStreetMap (41.139480, -73.403870)

Data MetricLocal Statistic
Postal / Zip Code06851
Primary CityNorwalk
State / ProvinceCT
CountyWestern Connecticut
Total Population27,865
Population Density1,399.7 people/sq mi
TimezoneAmerica/New_York

How 06851 Compares

MetricZIP 06851Western Connecticut County recordsCT records
Population estimate27,865627,079 (sum)3,624,508 (sum)
Population Density1,399.7 /sq mi----
County population rank#5 of 34----
State population rank#38 of 285----

Regional sums combine the population estimates in the listed ZIP records; they are not official county or state population totals.

Explore More ZIP Codes

Nearby ZIP Codes in CT

ZIP CodeCityDistancePopulation estimate
ZIP 06850Norwalk2.2 mi19,692
ZIP 06880Westport3.0 mi27,583
ZIP 06855Norwalk3.5 mi9,351
ZIP 06854Norwalk3.6 mi32,118
ZIP 06897Wilton5.0 mi18,777

Data Sources & Methodology: Geographic coordinates and ZIP Code assignments are derived from underlying geographic and postal datasets. Note that ZIP Codes are USPS postal delivery areas, while Census ZCTAs are statistical approximation areas. Read full methodology →