Last official estimated population of Mahoning County was 238,406 (year 2014)[1]. This was 0.075% of total US population and 2.1% of total Ohio state population. Area of Mahoning County is 425.2 mi² (=1101.2 km²), in this year population density was 560.71 p/mi². If population growth rate would be same as in period 2010-2014 (-0.04%/yr), Mahoning County population in 2026 would be 237,159 [0].
Historical population of Mahoning County for period 1850-2014 [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

[1850-1860] +0.87 %/yr
[1860-1870] +1.82 %/yr
[1870-1880] +3.29 %/yr
[1880-1890] +2.7 %/yr
[1890-1900] +2.28 %/yr
[1900-1910] +5.17 %/yr
[1910-1920] +4.84 %/yr
[1920-1930] +2.4 %/yr
[1930-1940] +0.17 %/yr
[1940-1950] +0.7 %/yr
[1950-1960] +1.55 %/yr
[1960-1970] +0.1 %/yr
[1970-1980] -0.47 %/yr
[1980-1990] -0.89 %/yr
[1990-2000] -0.28 %/yr
[2000-2005] -0.78 %/yr
[2005-2010] -0.73 %/yr
[2010-2014] -0.04 %/yr
Looking for settlements in Mahoning County? Visit this page: Settlements in Mahoning County, OH
Population of Mahoning County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 6195 | 5811 | 12,006 |
| 5 to 9 | 6609 | 6251 | 12,860 |
| 10 to 14 | 7208 | 6776 | 13,984 |
| 15 to 19 | 7327 | 7047 | 14,374 |
| 20 to 24 | 7807 | 7310 | 15,117 |
| 25 to 29 | 6903 | 6367 | 13,270 |
| 30 to 34 | 6454 | 6325 | 12,779 |
| 35 to 39 | 6396 | 6274 | 12,670 |
| 40 to 44 | 6976 | 6957 | 13,933 |
| 45 to 49 | 7273 | 7162 | 14,435 |
| 50 to 54 | 8318 | 8888 | 17,206 |
| 55 to 59 | 9022 | 9857 | 18,879 |
| 60 to 64 | 8280 | 8798 | 17,078 |
| 65 to 69 | 6386 | 6932 | 13,318 |
| 70 to 74 | 4282 | 5450 | 9,732 |
| 75 to 79 | 3173 | 4435 | 7,608 |
| 80 to 84 | 2460 | 3843 | 6,303 |
| 85+ | 2441 | 5211 | 7,652 |
Mahoning 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 | 106592 | 114086 | 220,678 |
| WAC | 94287 | 98672 | 192,959 |
| WA | 92140 | 96494 | 188,634 |
| NHWAC | 88598 | 94210 | 182,808 |
| NHWA | 86767 | 92352 | 179,119 |
| BAC | 19236 | 21101 | 40,337 |
| NHBAC | 18001 | 19924 | 37,925 |
| BA | 17649 | 19466 | 37,115 |
| NHBA | 16643 | 18533 | 35,176 |
| H | 6918 | 5608 | 12,526 |
| HWAC | 5689 | 4462 | 10,151 |
| HWA | 5373 | 4142 | 9,515 |
| TOM | 2349 | 2385 | 4,734 |
| NHTOM | 2000 | 2037 | 4,037 |
| AAC | 1421 | 1379 | 2,800 |
| NHAAC | 1323 | 1279 | 2,602 |
| HBAC | 1235 | 1177 | 2,412 |
| IAC | 1027 | 1093 | 2,120 |
| AA | 1014 | 990 | 2,004 |
| HBA | 1006 | 933 | 1,939 |
| NHAA | 979 | 943 | 1,922 |
| NHIAC | 742 | 828 | 1,570 |
| HTOM | 349 | 348 | 697 |
| IA | 304 | 315 | 619 |
| HIAC | 285 | 265 | 550 |
| NHIA | 179 | 200 | 379 |
| NAC | 156 | 135 | 291 |
| HIA | 125 | 115 | 240 |
| HAAC | 98 | 100 | 198 |
| NHNAC | 95 | 90 | 185 |
| HNAC | 61 | 45 | 106 |
| NA | 54 | 44 | 98 |
| HAA | 35 | 47 | 82 |
| HNA | 30 | 23 | 53 |
| NHNA | 24 | 21 | 45 |
• Stark County population
33.9 mi,
246°
• Trumbull County
20.4 mi,
0°
• Beaver County
31.5 mi,
135°
• Portage County
24.8 mi,
296°
• Mercer County
33.5 mi,
53°
• Columbiana County
16.6 mi,
181°
• Geauga County
39.7 mi,
328°
• Lawrence County
22.8 mi,
93°
• Hancock County
35.7 mi,
162°
• Carroll County
34.2 mi,
209°
[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
*Trumbull, Columbiana Ohio Notes
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