Residential delivery area · Kentucky
ZIP Code 42066: Mayfield, KY
ZIP code 42066 uses the postal name Mayfield, Kentucky and lies mostly in Graves County (98% of its land) with the rest in Marshall County (Census 2020 ZIP-county file). About 24,000 people live there (Census Bureau, ACS 2020-2024). Median household income is $48,664 (Census Bureau, ACS 2020-2024). By Census place, its land lies in Mayfield (3%), Pryorsburg (under 1%) and Hickory (under 1%); 95% is outside any Census place.
- ACS2020-24
- Census2020
- FHFA2025
- ZBP2023
- IRS2022
- Town
- Mayfield · its only residential ZIP
- County
- Graves County (98%); Marshall County (2%)
- Census places
- Mayfield (3%); Pryorsburg (under 1%) census-designated place; Hickory (under 1%) census-designated place
- Micro area
- Mayfield, KY
- House district
- KY-1 119th Congress
- State
- Kentucky
- Time zone
- Central
- Land area
- 217.3 sq mi · 110 people per sq mi
Where is ZIP code 42066?
42066 centers on 36.733°, -88.640° and covers 217.3 square miles of land plus 2.4 of water. It borders 9 ZIP codes: 42051, 42088, 42039, 42054, 42040, 42027, 42079, 42025, 42071.
The map draws ZIP code areas only. For the streets inside 42066, open its center on OpenStreetMap.
Source: U.S. Census Bureau, 2020 ZCTA cartographic boundaries and the 2023 Gazetteer (2020 ZCTAs); ZIP-to-county shares, Census places and House districts (119th Congress) from the Census 2020 relationship files (shares of land); metro area from the OMB delineation (July 2023); town name and time zone from simplemaps US ZIP Codes (CC BY 4.0).
How does 42066 compare with the rest of Graves County?
| Measure | 42066 | In Graves County | In KY |
|---|---|---|---|
| People (ACS 2020-2024) | 23,917 | 1st of 15 | 58th of 780 |
| Median household income | $49k | 5th of 6 | 252nd of 310 |
| Median home value | $146k | 3rd of 6 | 210th of 320 |
Its median household income is higher than in 13% of U.S. residential ZIP codes, and it is denser than 55% of all U.S. residential ZIP codes. ZIP codes at the ACS caps ($250,000 or more for household income, $2,000,000 or more for home value) share the top rank.
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B01003, B19013, B25077); ranks by PlainZIP over residential ZIP codes (ZCTAs).
How many people live in 42066?
The 2020 Census counted 23,081 people in 42066; the ACS, which samples households over 2020-2024, estimates 23,917. Between the 2010 and 2020 censuses its population fell 0.4% (its boundary stayed at least 90% the same).
- People, ACS 2020-2024
- 23,917
- 2020 Census count
- 23,081−0.4% since 2010 (23,182)
- Households
- 9,517
- Median age
- 39.8
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B01003, B01002, B11001); 2020 Census (DHC P1); 2010 Census (SF1 P1).
Who lives in 42066?
Of the 23,917 people the ACS estimates in 42066, 24.9% are under 18 and 18.8% are 65 or older. The largest group by race and Hispanic origin is White (not Hispanic) (80.0%), then Hispanic or Latino (10.5%).
- Under 1824.9%
- 18 to 6456.4%
- 65 and older18.8%
- White, not Hispanic80.0%
- Hispanic or Latino10.5%
- Black, not Hispanic5.8%
- Other or two or more3.5%
- Asian, not Hispanic0.3%
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B01001 age by sex, B03002 Hispanic or Latino origin by race); shares of the estimated population, small ZIP codes carry wide margins.
What do households in 42066 earn?
Median household income is $48,664 (ACS 2020-2024), the 5th highest of the 6 ranked ZIP codes in Graves County. It is not measurably different from 2015-2019 ($51,558 in 2024 dollars): the change is within the surveys' margins of error.
- Median household income
- $48,664
- Income per person
- $32,294
- Below the poverty line
- 21.1%
- Unemployed (of the labor force)
- 2.9%
- Adults 25+ with a bachelor's degree
- 19.9%
- Adjusted gross income per tax return, 2022
- $61,2299,170 returns; wages 67% of AGI (IRS)
Source: U.S. Census Bureau, ACS 2020-2024 and 2015-2019 5-year estimates (B19013, B19301, B17001, B23025, B15003; 2015-2019 dollars converted with the BLS CPI-U, 1.22699); IRS Statistics of Income, ZIP code data, tax year 2022 (adjusted gross income per return, filed under the address on the return).
What are homes worth in 42066?
FHFA's house price index for 42066, built from repeat sales and appraisals of the same homes, rose 60% from 2015 to 2025 and rose 43% from 2020 to 2025, and moved +6.9% in 2025.
- Median home value (owners' estimate)
- $145,600
- Median gross rent
- $774
- Homes owned by their occupants
- 72.2%
- Housing units
- 11,029
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B25077, B25064, B25003, B25001); FHFA House Price Index, annual five-digit ZIP, updated 2026-03-31.
What businesses are in 42066?
525 business establishments had a location in this ZIP code in 2023, 5 fewer than in 2018; the most are in retail trade (ZIP Code Business Patterns).
- Retail trade104
- Health care and social assistance70
- Other services (except public administration)52
- Construction45
- Finance and insurance43
- Accommodation and food services43
Source: U.S. Census Bureau, ZIP Code Business Patterns 2023 and 2018 (establishments with paid employees, by the business's ZIP code).
Which ZIP codes are next to 42066?
| ZIP | Town | People | Household income | Distance |
|---|---|---|---|---|
| 42051 | Hickory | 2,114 | $76k | 8.8 mi |
| 42088 | Wingo | 2,497 | $53k | 10.2 mi |
| 42039 | Fancy Farm | 1,694 | $71k | 11.0 mi |
| 42054 | Kirksey | 837 | $59k | 11.5 mi |
| 42040 | Farmington | 692 | $51k | 11.6 mi |
| 42027 | Boaz | 1,875 | $58k | 12.9 mi |
| 42079 | Sedalia | 1,315 | $59k | 13.7 mi |
| 42025 | Benton | 19,941 | $70k | 19.0 mi |
| 42071 | Murray | 30,981 | $50k | 21.4 mi |
| 42061 | Lowes | 59 | – | 12.5 mi (near) |
Source: PlainZIP from the Census 2020 ZCTA boundaries (shared edges) and internal points; figures ACS 2020-2024.