Last official estimated population of Lancaster County was 520,317 (year 2014)[1]. This was 0.163% of total US population and 4.1% of total Pennsylvania state population. Area of Lancaster County is 983.8 mi² (=2548 km²), in this year population density was 528.88 p/mi². If population growth rate would be same as in period 2010-2014 (+0.04%/yr), Lancaster County population in 2025 would be 522,723 [0].
Historical population of Lancaster 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] +1.85 %/yr
[1800-1810] +2.19 %/yr
[1810-1820] +2.4 %/yr
[1820-1830] +1.15 %/yr
[1830-1840] +0.95 %/yr
[1840-1850] +1.63 %/yr
[1850-1860] +1.63 %/yr
[1860-1870] +0.42 %/yr
[1870-1880] +1.4 %/yr
[1880-1890] +0.67 %/yr
[1890-1900] +0.66 %/yr
[1900-1910] +0.48 %/yr
[1910-1920] +0.4 %/yr
[1920-1930] +1.25 %/yr
[1930-1940] +0.77 %/yr
[1940-1950] +1 %/yr
[1950-1960] +1.72 %/yr
[1960-1970] +1.39 %/yr
[1970-1980] +1.26 %/yr
[1980-1990] +1.56 %/yr
[1990-2000] +1.08 %/yr
[2000-2005] +1 %/yr
[2005-2010] +0.98 %/yr
[2010-2014] +0.04 %/yr
Looking for settlements in Lancaster County? Visit this page: Settlements in Lancaster County, PA
Population of Lancaster County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 18032 | 17029 | 35,061 |
| 5 to 9 | 18324 | 17479 | 35,803 |
| 10 to 14 | 18387 | 17723 | 36,110 |
| 15 to 19 | 18459 | 18037 | 36,496 |
| 20 to 24 | 17616 | 17502 | 35,118 |
| 25 to 29 | 17533 | 17728 | 35,261 |
| 30 to 34 | 16059 | 16144 | 32,203 |
| 35 to 39 | 14705 | 15096 | 29,801 |
| 40 to 44 | 15509 | 15803 | 31,312 |
| 45 to 49 | 16400 | 16850 | 33,250 |
| 50 to 54 | 18286 | 19222 | 37,508 |
| 55 to 59 | 17881 | 18672 | 36,553 |
| 60 to 64 | 15122 | 16337 | 31,459 |
| 65 to 69 | 12530 | 13707 | 26,237 |
| 70 to 74 | 9181 | 10524 | 19,705 |
| 75 to 79 | 6656 | 8233 | 14,889 |
| 80 to 84 | 5106 | 7084 | 12,190 |
| 85+ | 5061 | 9303 | 14,364 |
Lancaster 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 |
| WAC | 240514 | 252275 | 492,789 |
| WA | 235971 | 247566 | 483,537 |
| NH | 234703 | 246318 | 481,021 |
| NHWAC | 219304 | 231183 | 450,487 |
| NHWA | 215929 | 227613 | 443,542 |
| H | 26144 | 26155 | 52,299 |
| HWAC | 21210 | 21092 | 42,302 |
| HWA | 20042 | 19953 | 39,995 |
| BAC | 16481 | 15835 | 32,316 |
| BA | 13197 | 12357 | 25,554 |
| NHBAC | 11887 | 11073 | 22,960 |
| NHBA | 9534 | 8542 | 18,076 |
| AAC | 6441 | 7147 | 13,588 |
| NHAAC | 6067 | 6780 | 12,847 |
| AA | 5467 | 6190 | 11,657 |
| NHAA | 5247 | 5964 | 11,211 |
| TOM | 4863 | 5036 | 9,899 |
| HBAC | 4594 | 4762 | 9,356 |
| HBA | 3663 | 3815 | 7,478 |
| NHTOM | 3600 | 3787 | 7,387 |
| IAC | 2160 | 2161 | 4,321 |
| HTOM | 1263 | 1249 | 2,512 |
| HIAC | 1109 | 1056 | 2,165 |
| NHIAC | 1051 | 1105 | 2,156 |
| IA | 1089 | 1049 | 2,138 |
| HIA | 767 | 714 | 1,481 |
| NAC | 424 | 441 | 865 |
| HAAC | 374 | 367 | 741 |
| NHIA | 322 | 335 | 657 |
| NA | 260 | 275 | 535 |
| HNAC | 245 | 251 | 496 |
| HAA | 220 | 226 | 446 |
| HNA | 189 | 198 | 387 |
| NHNAC | 179 | 190 | 369 |
| NHNA | 71 | 77 | 148 |
• Baltimore County population
45.7 mi, 
205°
• New Castle County
45.5 mi, 
135°
• Chester County
26.9 mi, 
100°
• York County
26.7 mi, 
251°
• Berks County
30.8 mi, 
33°
• Dauphin County
38.4 mi, 
311°
• Harford County
35 mi, 
184°
• Schuylkill County
45.7 mi, 
2°
• Lebanon County
25.4 mi, 
333°
• Cecil County
37 mi, 
153°
[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
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