Last official estimated population of Sussex County was 197,904 (year 2014)[1]. This was 0.062% of total US population and 20.9% of total Delaware state population. Area of Sussex County is 1,196.4 mi² (=3098.7 km²), in this year population density was 165.41 p/mi². If population growth rate would be same as in period 2010-2014 (+0.1%/yr), Sussex County population in 2026 would be 200,199 [0].
Historical population of Sussex 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] -0.57 %/yr
[1800-1810] +3.67 %/yr
[1810-1820] -1.42 %/yr
[1820-1830] +1.2 %/yr
[1830-1840] -0.77 %/yr
[1840-1850] +0.33 %/yr
[1850-1860] +1.34 %/yr
[1860-1870] +0.68 %/yr
[1870-1880] +1.29 %/yr
[1880-1890] +0.71 %/yr
[1890-1900] +0.9 %/yr
[1900-1910] +0.94 %/yr
[1910-1920] -0.59 %/yr
[1920-1930] +0.4 %/yr
[1930-1940] +1.44 %/yr
[1940-1950] +1.57 %/yr
[1950-1960] +1.78 %/yr
[1960-1970] +0.94 %/yr
[1970-1980] +2.01 %/yr
[1980-1990] +1.45 %/yr
[1990-2000] +3.29 %/yr
[2000-2005] +2.52 %/yr
[2005-2010] +2.15 %/yr
[2010-2014] +0.1 %/yr
Looking for settlements in Sussex County? Visit this page: Settlements in Sussex County, DE
Population of Sussex County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 5995 | 5708 | 11,703 |
| 5 to 9 | 5947 | 5907 | 11,854 |
| 10 to 14 | 5715 | 5425 | 11,140 |
| 15 to 19 | 5246 | 4970 | 10,216 |
| 20 to 24 | 5651 | 5312 | 10,963 |
| 25 to 29 | 5513 | 5574 | 11,087 |
| 30 to 34 | 5495 | 5470 | 10,965 |
| 35 to 39 | 5010 | 5101 | 10,111 |
| 40 to 44 | 5457 | 5724 | 11,181 |
| 45 to 49 | 6051 | 6506 | 12,557 |
| 50 to 54 | 7161 | 7717 | 14,878 |
| 55 to 59 | 7364 | 8504 | 15,868 |
| 60 to 64 | 7879 | 9348 | 17,227 |
| 65 to 69 | 8481 | 9416 | 17,897 |
| 70 to 74 | 6568 | 7045 | 13,613 |
| 75 to 79 | 4281 | 4603 | 8,884 |
| 80 to 84 | 2654 | 3127 | 5,781 |
| 85+ | 1734 | 3190 | 4,924 |
Sussex 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 | 91942 | 99274 | 191,216 |
| WAC | 86217 | 91663 | 177,880 |
| WA | 84332 | 89626 | 173,958 |
| NHWAC | 77627 | 83854 | 161,481 |
| NHWA | 75993 | 82086 | 158,079 |
| BAC | 14433 | 15515 | 29,948 |
| NHBAC | 13628 | 14728 | 28,356 |
| BA | 13013 | 13955 | 26,968 |
| NHBA | 12405 | 13373 | 25,778 |
| H | 10260 | 9373 | 19,633 |
| HWAC | 8590 | 7809 | 16,399 |
| HWA | 8339 | 7540 | 15,879 |
| TOM | 2117 | 2325 | 4,442 |
| IAC | 2015 | 2056 | 4,071 |
| NHTOM | 1828 | 2018 | 3,846 |
| AAC | 1561 | 1707 | 3,268 |
| NHAAC | 1450 | 1601 | 3,051 |
| IA | 1357 | 1271 | 2,628 |
| AA | 1221 | 1342 | 2,563 |
| NHAA | 1150 | 1270 | 2,420 |
| NHIAC | 1070 | 1147 | 2,217 |
| HIAC | 945 | 909 | 1,854 |
| HIA | 836 | 790 | 1,626 |
| HBAC | 805 | 787 | 1,592 |
| HBA | 608 | 582 | 1,190 |
| NHIA | 521 | 481 | 1,002 |
| HTOM | 289 | 307 | 596 |
| NAC | 241 | 216 | 457 |
| NA | 162 | 128 | 290 |
| HNAC | 130 | 103 | 233 |
| NHNAC | 111 | 113 | 224 |
| HAAC | 111 | 106 | 217 |
| HNA | 117 | 82 | 199 |
| HAA | 71 | 72 | 143 |
| NHNA | 45 | 46 | 91 |
• Kent County population
30.6 mi, 
343°
• Cumberland County
46.7 mi, 
14°
• Wicomico County
26.5 mi, 
217°
• Cape May County
38.8 mi, 
42°
• Worcester County
31.2 mi, 
177°
• Queen Anne's County
47.5 mi, 
302°
• Talbot County
45.7 mi, 
276°
• Caroline County
30 mi, 297°
• Dorchester County
41.9 mi, 
246°
• Somerset County
49.9 mi, 
214°
[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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