Middlesex County · Connecticut
ZIP code 06423
- Population
- 5,163
- Median income
- $106,217
- Median home
- $374,300
- Sales tax
- 6.35%
ZCTA residents
Household, past 12 months
Owner-occupied value
Connecticut state rate
Quick answer
ZIP 06423 sits in Middlesex County, Connecticut and is home to 5,163 people. Median household income is $106,217, the median home is worth $374,300 and median gross rent is $1,611. 94.8% of households own their home, and purchases are taxed at 6.35% (Connecticut state rate).
- County
- Middlesex County
- State
- Connecticut (CT)
- Area codes
- Not published
- Metro area
- Outside covered metros
FIPS 09007
288 ZIPs covered
No NANPA match for this ZIP
Rate jurisdiction used for tax
The numbers for 06423
American Community Survey 2019-2023 ACS 5-year estimates for this ZCTA.
- Population
- 5,163ZIP 06423 residents
- Median household income
- $106,217Past 12 months, inflation adjusted
- Median home value
- $374,300Owner-occupied units
- Median gross rent
- $1,611Rent plus utilities, monthly
- Median age
- 50.9 yrsAll residents
- Homeownership rate
- 94.8%Owner-occupied households
Sales tax in 06423
What a purchase inside this ZIP costs at checkout.
Connecticut levies 6.35% statewide with no local add-ons. Check the county page for the local component before you quote a price.
Affordability in this ZIP
Derived from the Census medians above — indicative, not an offer.
A rent burden above 30% is the federal threshold for cost-burdened households, and a price-to-income multiple above 4× is generally considered a stretched housing market. The mortgage figure is principal and interest only — taxes, insurance and HOA dues are extra.
How 06423 compares
ZIP 06423 against the median ZIP in Middlesex County and across Connecticut.
| Measure | ZIP 06423 | County median | State median | vs state |
|---|---|---|---|---|
| Median household income | $106,217 | $109,901 | $105,813 | even |
| Median home value | $374,300 | $375,400 | $348,800 | +7% |
| Median gross rent | $1,611 | $1,392 | $1,432 | +13% |
| Population | 5,163 | 4,432 | 7,984 | -35% |
Medians are computed across the 23 ZIP areas in Middlesex County and the 288 ZIP areas in Connecticut.
Statewide rank
Where this ZIP places among all 288 Connecticut ZIP areas.
- Income
- #134
- Home value
- #110
- Population
- #182
richer than 50% of 270 state ZIPs
above 60% of 273 state ZIPs
larger than 37% of 288 state ZIPs
Comparable ZIP codes
Connecticut ZIP areas with almost the same household income.
Nearby ZIP codes
Other ZIP codes filed under Middlesex County.
ZIP 06423 questions
Common questions about this ZIP code.
- Where is ZIP code 06423?
- ZIP 06423 lies mostly in Middlesex County, Connecticut. County assignment follows the largest share of land area, so a ZIP straddling a county line is filed under its dominant county.
- What sales tax do I pay in 06423?
- Connecticut charges 6.35% statewide.
- Is 06423 expensive to live in?
- Median rent runs $1,611 a month, about 18% of median household income, and the median home is worth $374,300 — +7% against the typical Connecticut ZIP.
- Is a ZCTA the same as a postal ZIP code?
- Not exactly. The Census builds ZIP Code Tabulation Areas from the ZIP codes of addresses inside each census block, so a ZCTA can differ slightly from the USPS delivery route of the same number, and PO-box-only ZIPs have no ZCTA at all.
Keep going
Related pages for this area.
Sources & transparency
- US Census Bureau, ACS 2019-2023 5-year estimates — 2019-2023 ACS 5-year — population, income, housing
- Census 2020 ZCTA-to-county relationship file — County assignment by largest land-area overlap
- Connecticut Department of Revenue Services — Sales tax rates and local add-ons
Last reviewed December 2024. Figures are published for reference and can change; verify with the source agency before filing or contracting. How we build and check this data.