Simpson County, KY ZIP Codes
3 ZIP codes cover all or part of Simpson County, Kentucky: 42134, 42206 and 42170. The Census Bureau counts 19,972 residents in the county, with a median household income of $59,858 and a median home value of $229,400. Median household income ranges from $59,113 in 42134 to $96,111 in 42170. Its largest communities include Franklin.
Simpson County (Census county figures)
| Measure | Census figure |
|---|---|
| Residents | 19,972 |
| Households | 8,025 |
| Median household income | $59,858 |
| Median home value | $229,400 |
| Median age | 38.8 |
| Median rent | $1,012 |
All 3 ZIP codes together
| Measure | Value |
|---|---|
| Residents (sum of ZIP codes) | 27,215 |
| Households (sum of ZIP codes) | 10,451 |
| Median household income, range across ZIP codes | $59,113 (42134) to $96,111 (42170) |
| Household-weighted average of ZIP medians (an approximation, not a true median) | $62,825 |
| Homeowners | 69.5% |
| Households with kids under 18 | 29.4% |
| Moved in the past year | 13.0% |
| Carrier routes in EDDM2GO's route library | 20 routes, 11,816 homes (3 of 3 ZIP codes) |
Top facts
- Highest median household income in Simpson County: 42170 ($96,111)
- Most residents: 42134 (19,380 people)
- Highest homeownership: 42206 (83.7% own their home)
- Most households with kids: 42170 (44.3% of households)
- Most new movers: 42170 (15.7% moved in last year)
- Youngest median age: 42170 (31.3 years)
- Highest median home value: 42170 ($291,700)
Every ZIP code in Simpson County
| ZIP | Mailing city | Residents | Households | Median income | Home value | Homeowners | With kids | New movers | Carrier routes | Mailboxes | Why listed |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 42134 | Franklin | 19,380 | 7,674 | $59,113 | $226,800 | 65.3% | 28.6% | 13.0% | 14 | 9,338 | 93% of its land |
| 42206 | Auburn | 5,897 | 2,183 | $66,815 | $167,700 | 83.7% | 28.1% | 11.9% | 5 | 2,478 | 13% of its land |
| 42170 | Woodburn | 1,938 | 594 | $96,111 | $291,700 | 72.2% | 44.3% | 15.7% | 1 | 602 | 49% of its land |
A ZIP code is listed for Simpson County when at least 10% of its land is in the county, when it holds at least 10% of the county's land, or when the county is its main county. Totals add up whole ZIP codes, including parts that cross the county line; the Census county figures above do not.
Cities and communities
- Franklin — 10,360 residents · 1 ZIP code
Price a mailing to Simpson County ZIP codes
EDDM guides
Pick carrier routes on the EDDM route map
Frequently asked questions
- What ZIP codes are in Simpson County, KY?
- 42134, 42206 and 42170. Some cross the county line; the table shows each ZIP's share of land in the county.
- What is the population of Simpson County?
- 19,972 residents in 8,025 households (ACS 5-year estimates, 2020–2024).
- What is the median household income in Simpson County?
- $59,858 for the county as a whole. Its ZIP codes range from $59,113 (42134) to $96,111 (42170).
- Which Simpson County ZIP code has the highest median household income?
- 42170, at $96,111, among ZIP codes with at least 1,000 residents.
- How many carrier routes and mailboxes are in Simpson County?
- For the 3 of 3 ZIP codes in EDDM2GO's stored route library: 20 carrier routes reaching 11,816 residential and 605 business mailboxes.
This product uses the Census Bureau Data API but is not endorsed or certified by the Census Bureau.