Last official estimated population of Mifflin County was 46,657 (year 2014)[1]. This was 0.015% of total US population and 0.4% of total Pennsylvania state population. Area of Mifflin County is 414.7 mi² (=1074.1 km²), in this year population density was 112.50 p/mi². If population growth rate would be same as in period 2010-2014 (-0.01%/yr), Mifflin County population in 2026 would be 46,582 [0].
Historical population of Mifflin County for period 1790-2014 [1] , [2] , [3]:
Estimated population for 2014[1]. Population density is in p./sq.mi [4]. Changes are for period 2010-2015. Value is %/year. Boundary lines are approx. 2012 [5]. Click on flag to hide it.
Population • Density • Changes • Legends • Position
[1790-1800] +6.05 %/yr
[1800-1810] -1.14 %/yr
[1810-1820] +3.2 %/yr
[1820-1830] +2.7 %/yr
[1830-1840] -4.92 %/yr
[1840-1850] +1.36 %/yr
[1850-1860] +0.87 %/yr
[1860-1870] +0.69 %/yr
[1870-1880] +1.12 %/yr
[1880-1890] +0.21 %/yr
[1890-1900] +1.48 %/yr
[1900-1910] +1.84 %/yr
[1910-1920] +1.24 %/yr
[1920-1930] +2.52 %/yr
[1930-1940] +0.64 %/yr
[1940-1950] +0.16 %/yr
[1950-1960] +0.15 %/yr
[1960-1970] +0.21 %/yr
[1970-1980] +0.36 %/yr
[1980-1990] -0.15 %/yr
[1990-2000] +0.06 %/yr
[2000-2005] -0.04 %/yr
[2005-2010] +0.13 %/yr
[2010-2014] -0.01 %/yr
Looking for settlements in Mifflin County? Visit this page: Settlements in Mifflin County, PA
Population of Mifflin County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 1435 | 1343 | 2,778 |
| 5 to 9 | 1487 | 1444 | 2,931 |
| 10 to 14 | 1577 | 1426 | 3,003 |
| 15 to 19 | 1428 | 1320 | 2,748 |
| 20 to 24 | 1258 | 1235 | 2,493 |
| 25 to 29 | 1280 | 1220 | 2,500 |
| 30 to 34 | 1244 | 1263 | 2,507 |
| 35 to 39 | 1181 | 1185 | 2,366 |
| 40 to 44 | 1399 | 1465 | 2,864 |
| 45 to 49 | 1579 | 1589 | 3,168 |
| 50 to 54 | 1682 | 1719 | 3,401 |
| 55 to 59 | 1636 | 1624 | 3,260 |
| 60 to 64 | 1497 | 1585 | 3,082 |
| 65 to 69 | 1265 | 1494 | 2,759 |
| 70 to 74 | 1130 | 1199 | 2,329 |
| 75 to 79 | 791 | 922 | 1,713 |
| 80 to 84 | 537 | 761 | 1,298 |
| 85+ | 473 | 879 | 1,352 |
Mifflin County resident population estimates by Sex, Race, and Hispanic Origin[1b]. For full list of abbrevations see: population.us/about page.
| Race | Male | Female | Total |
| NH | 22556 | 23376 | 45,932 |
| WAC | 22497 | 23349 | 45,846 |
| WA | 22307 | 23095 | 45,402 |
| NHWAC | 22212 | 23075 | 45,287 |
| NHWA | 22033 | 22840 | 44,873 |
| H | 323 | 297 | 620 |
| BAC | 321 | 289 | 610 |
| HWAC | 285 | 274 | 559 |
| NHBAC | 285 | 256 | 541 |
| HWA | 274 | 255 | 529 |
| TOM | 200 | 270 | 470 |
| NHTOM | 188 | 248 | 436 |
| AAC | 160 | 201 | 361 |
| NHAAC | 157 | 199 | 356 |
| BA | 215 | 139 | 354 |
| NHBA | 188 | 124 | 312 |
| AA | 116 | 136 | 252 |
| NHAA | 114 | 135 | 249 |
| IAC | 88 | 93 | 181 |
| NHIAC | 81 | 86 | 167 |
| HBAC | 36 | 33 | 69 |
| IA | 33 | 27 | 60 |
| NHIA | 29 | 27 | 56 |
| HBA | 27 | 15 | 42 |
| HTOM | 12 | 22 | 34 |
| NAC | 18 | 15 | 33 |
| NHNAC | 14 | 11 | 25 |
| NA | 8 | 6 | 14 |
| HIAC | 7 | 7 | 14 |
| HNAC | 4 | 4 | 8 |
| HNA | 4 | 4 | 8 |
| NHNA | 4 | 2 | 6 |
| HAAC | 3 | 2 | 5 |
| HIA | 4 | 0 | 4 |
| HAA | 2 | 1 | 3 |
• Cumberland County population
36.5 mi, 
145°
• Centre County
23.6 mi, 
334°
• Franklin County
46.8 mi, 
184°
• Blair County
35.3 mi, 
258°
• Perry County
24.7 mi, 
124°
• Huntingdon County
20.7 mi, 
233°
• Union County
39.9 mi, 
51°
• Snyder County
32.1 mi, 
70°
• Clinton County
44.5 mi, 
0°
• Juniata County
14.1 mi, 
110°
[0] Calculated by population.us from last known population growth rate, not official data.
[1] County population - 2014, archived from the original, retrieved 02/23/2016
[1b] Annual County Resident Population Estimates by Age, Sex, Race, and Hispanic Origin, (used only data for 2014) archived from the original, retrieved 02/23/2016
[2] County population - 2000-2010, archived from the original, retrieved 02/23/2016
[3] Population of States and Counties of the United States: 1790 to 1992, PDF, 15 Mb, census.gov, retrieved 02/23/2016
[4] County area, latitude longitude data, retrieved 02/23/2016
[5] County boundaries, CSV files on boundaries.us, retrived 03/18/2016
See note 8 Pennsylvania Notes
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