Youngest ZIP codes in Butler County, PA
These are the 25 ZIP codes in Butler County with the lowest median age, out of 25 with at least 1,000 residents. 16057 (Slippery Rock, 25.9), 16040 (Hilliards, 38.3) and 16066 (Cranberry Township, 40.0) lead the list. There is no single "best" ZIP code in Butler County; the right one depends on who you want to reach, so the same ZIP codes are ranked several ways below.
Youngest ZIP codes in Butler County
| Rank | ZIP | Mailing city | Median age | Residents | Households | Residential mailboxes |
|---|---|---|---|---|---|---|
| 1 | 16057 | Slippery Rock | 25.9 ±2.5 | 15,718 | 5,194 | 4,850 |
| 2 | 16040 | Hilliards | 38.3 ±4.4 | 1,013 | 346 | 368 |
| 3 | 16066 | Cranberry Township | 40.0 ±1.3 | 33,873 | 14,048 | 15,073 |
| 4 | 16063 | Zelienople | 41.3 ±1.6 | 8,256 | 3,440 | 4,294 |
| 5 | 16046 | Mars | 41.5 ±0.8 | 19,757 | 7,290 | 7,478 |
| 6 | 16045 | Lyndora | 42.3 ±11.8 | 1,136 | 478 | — |
| 7 | 16050 | Petrolia | 42.8 ±2.8 | 1,097 | 485 | 486 |
| 8 | 16020 | Boyers | 44.3 ±9.0 | 1,169 | 451 | 431 |
| 9 | 16001 | Butler | 44.9 ±2.1 | 39,234 | 17,900 | 18,886 |
| 10 | 16051 | Portersville | 45.4 ±4.1 | 3,119 | 1,315 | 1,227 |
| 11 | 16059 | Valencia | 45.5 ±3.8 | 10,062 | 3,971 | 4,261 |
| 12 | 16052 | Prospect | 45.5 ±2.4 | 2,215 | 822 | 942 |
| 13 | 16056 | Saxonburg | 45.6 ±3.3 | 4,232 | 1,760 | 2,015 |
| 14 | 16061 | West Sunbury | 45.7 ±4.4 | 2,564 | 958 | 992 |
| 15 | 16033 | Evans City | 46.0 ±3.8 | 8,185 | 3,368 | 3,138 |
| 16 | 16049 | Parker | 46.4 ±4.5 | 2,965 | 1,207 | 1,307 |
| 17 | 16034 | Fenelton | 46.8 ±5.5 | 1,752 | 786 | 705 |
| 18 | 16041 | Karns City | 47.7 ±1.4 | 1,747 | 700 | — |
| 19 | 16002 | Butler | 48.3 ±4.4 | 15,587 | 6,340 | 6,194 |
| 20 | 16025 | Chicora | 48.3 ±3.5 | 4,793 | 1,918 | 1,865 |
| 21 | 16038 | Harrisville | 48.5 ±3.1 | 3,292 | 1,306 | 1,169 |
| 22 | 16037 | Harmony | 49.7 ±4.6 | 5,291 | 2,116 | 2,677 |
| 23 | 16055 | Sarver | 50.1 ±2.4 | 8,993 | 3,535 | 3,741 |
| 24 | 16023 | Cabot | 54.1 ±4.5 | 4,082 | 1,648 | 1,768 |
| 25 | 16053 | Renfrew | 56.1 ±5.2 | 3,429 | 1,673 | 1,828 |
How we ranked them
Ranked by median age of all residents, lowest first (ACS 5-year estimates, 2020–2024). ZIP codes need at least 1,000 residents to be ranked; 25 of 33 qualify.
Which of these to mail, and why
Younger ZIP codes skew toward renters, students and young families: fitness, quick-service food, apartments, entertainment and first-time-buyer offers.
The top five ZIP codes on this list hold 30,318 households, on 54 carrier routes with 32,063 residential mailboxes. Open any of them on the route map to see each carrier route's own figures before you choose.
Open 16057 on the EDDM route map
More rankings
- Richest ZIP codes in Butler County
- ZIP codes with the highest home values in Butler County
- ZIP codes with the highest homeownership in Butler County
- ZIP codes with the most families with kids in Butler County
- ZIP codes with the most new movers in Butler County
- Oldest ZIP codes in Butler County
- Fastest-growing ZIP codes in Butler County
- All Butler County ZIP codes
Businesses that mail these ZIP codes
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EDDM guides
Frequently asked questions
- Which ZIP code in Butler County has the lowest median age?
- 16057 (Slippery Rock), at 25.9 (±2.5), among 25 ZIP codes with at least 1,000 residents.
- How is this ranking calculated?
- Ranked by median age of all residents, lowest first (ACS 5-year estimates, 2020–2024).
- Why are some ZIP codes missing?
- ZIP codes with fewer than 1,000 residents are left out because their survey estimates swing too much to rank, and so are ZIP codes where the Census Bureau did not publish this figure.
This product uses the Census Bureau Data API but is not endorsed or certified by the Census Bureau.