The median income of Williamson County residents was $39,583 per year, adjusted for inflation. It had 180,160 households with a population of 547,604.
The county with the highest median resident income in the state was Rockwall County with $46,518 per year after adjusting for inflation – $6,935 more than Williamson County. It had 33,032 households with a population of 97,175.
The county with the lowest median resident income in the state was Starr County with $14,038 per year after adjusting for inflation – $25,545 less than Williamson County. It had 16,188 households with a population of 64,078.
Top 100 counties by earnings per resident (2019)
| Rank | County | Earnings per resident |
|---|---|---|
| 1 | Rockwall County | $46,518 |
| 2 | Collin County | $46,479 |
| 3 | Fort Bend County | $40,880 |
| 4 | Denton County | $40,677 |
| 5 | Brazoria County | $40,496 |
| 6 | Travis County | $39,860 |
| 7 | Williamson County | $39,583 |
| 8 | Midland County | $38,804 |
| 9 | Carson County | $38,411 |
| 10 | Reagan County | $38,030 |
| 11 | Montgomery County | $37,915 |
| 12 | Chambers County | $37,261 |
| 13 | Sterling County | $36,827 |
| 14 | Comal County | $36,265 |
| 15 | Borden County | $35,926 |
| 16 | Hemphill County | $35,830 |
| 17 | Kendall County | $34,853 |
| 18 | Ellis County | $34,653 |
| 19 | Yoakum County | $34,598 |
| 20 | Randall County | $34,417 |
| 21 | Galveston County | $34,255 |
| 22 | Hartley County | $34,152 |
| 23 | Guadalupe County | $33,952 |
| 24 | King County | $33,750 |
| 25 | Andrews County | $33,373 |
| 26 | Tarrant County | $33,326 |
| 27 | Martin County | $33,282 |
| 28 | Wilson County | $32,643 |
| 29 | Archer County | $32,611 |
| 30 | McMullen County | $32,325 |
| 31 | Parker County | $32,185 |
| 32 | Johnson County | $31,846 |
| 33 | Ector County | $31,823 |
| 34 | Kaufman County | $31,774 |
| 35 | Crockett County | $31,618 |
| 36 | Orange County | $31,543 |
| 37 | Hays County | $31,519 |
| 38 | Ward County | $31,467 |
| 39 | Harris County | $31,323 |
| 40 | Moore County | $31,237 |
| 41 | Armstrong County | $31,212 |
| 42 | Hood County | $31,204 |
| 43 | Dallas County | $31,136 |
| 44 | Cooke County | $30,926 |
| 45 | Irion County | $30,909 |
| 46 | Hardin County | $30,905 |
| 47 | Roberts County | $30,806 |
| 48 | Austin County | $30,570 |
| 49 | Dallam County | $30,367 |
| 50 | Sutton County | $30,298 |
| 51 | Lampasas County | $30,269 |
| 52 | Blanco County | $30,193 |
| 53 | Burleson County | $30,170 |
| 54 | Somervell County | $30,157 |
| 55 | Fayette County | $30,069 |
| 56 | Bastrop County | $30,057 |
| 57 | Wise County | $29,858 |
| 58 | Colorado County | $29,522 |
| 59 | Lavaca County | $29,296 |
| 60 | Bell County | $29,284 |
| 61 | Parmer County | $29,158 |
| 62 | Fannin County | $28,875 |
| 63 | Lee County | $28,827 |
| 64 | Upton County | $28,795 |
| 65 | Winkler County | $28,788 |
| 66 | Gillespie County | $28,772 |
| 66 | Castro County | $28,772 |
| 68 | Franklin County | $28,613 |
| 69 | Washington County | $28,376 |
| 70 | Kent County | $28,333 |
| 71 | Sherman County | $28,307 |
| 72 | Deaf Smith County | $28,087 |
| 73 | Bexar County | $27,976 |
| 74 | Goliad County | $27,950 |
| 75 | Oldham County | $27,938 |
| 76 | Grayson County | $27,892 |
| 77 | Childress County | $27,867 |
| 78 | Comanche County | $27,745 |
| 79 | Scurry County | $27,681 |
| 80 | Jefferson County | $27,672 |
| 81 | Clay County | $27,652 |
| 82 | Bowie County | $27,641 |
| 83 | Fisher County | $27,609 |
| 84 | Tom Green County | $27,568 |
| 85 | Gaines County | $27,542 |
| 86 | Kerr County | $27,511 |
| 87 | Jackson County | $27,460 |
| 88 | Brewster County | $27,435 |
| 89 | Burnet County | $27,425 |
| 90 | Jeff Davis County | $27,405 |
| 91 | Pecos County | $27,388 |
| 92 | Smith County | $27,384 |
| 93 | Nueces County | $27,335 |
| 94 | Victoria County | $27,297 |
| 95 | Crane County | $27,260 |
| 96 | Lipscomb County | $27,259 |
| 97 | Liberty County | $27,199 |
| 97 | Young County | $27,199 |
| 99 | Caldwell County | $27,173 |
| 100 | Gonzales County | $27,132 |
* All values are inflation-adjusted
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