| Zip code | City | State | Number of returns | Total income ($1000) | Avg income/return |
| 19807 | Wilmington | Delaware | 4,120 | $1,173,712 | $284,882 |
| 19707 | Hockessin | Delaware | 8,400 | $992,258 | $118,126 |
| 19736 | Yorklyn | Delaware | 150 | $16,718 | $111,453 |
| 19803 | Wilmington | Delaware | 10,960 | $1,192,053 | $108,764 |
| 19806 | Wilmington | Delaware | 5,090 | $543,257 | $106,730 |
| 19930 | Bethany Beach | Delaware | 1,370 | $138,730 | $101,263 |
| 19971 | Rehoboth Beach | Delaware | 7,040 | $614,042 | $87,222 |
| 19810 | Wilmington | Delaware | 12,810 | $1,027,219 | $80,189 |
| 19711 | Newark | Delaware | 21,810 | $1,716,864 | $78,719 |
| 19944 | Fenwick Island | Delaware | 250 | $19,155 | $76,620 |
| 19709 | Middletown | Delaware | 17,840 | $1,323,171 | $74,169 |
| 19958 | Lewes | Delaware | 11,630 | $862,097 | $74,127 |
| 19970 | Ocean View | Delaware | 3,500 | $252,693 | $72,198 |
| 19701 | Bear | Delaware | 20,260 | $1,336,958 | $65,990 |
| 19734 | Townsend | Delaware | 5,240 | $342,120 | $65,290 |
| 19808 | Wilmington | Delaware | 19,870 | $1,294,061 | $65,126 |
| 19967 | Millville | Delaware | 430 | $26,967 | $62,714 |
| 19934 | Camden Wyoming | Delaware | 6,270 | $387,351 | $61,778 |
| 19809 | Wilmington | Delaware | 7,260 | $440,066 | $60,615 |
| 19939 | Dagsboro | Delaware | 3,140 | $189,121 | $60,230 |
| 19975 | Selbyville | Delaware | 4,160 | $247,411 | $59,474 |
| 19968 | Milton | Delaware | 5,520 | $327,074 | $59,253 |
| 19931 | Bethel | Delaware | 140 | $8,278 | $59,129 |
| 19951 | Harbeson | Delaware | 850 | $49,641 | $58,401 |
| 19702 | Newark | Delaware | 25,480 | $1,445,102 | $56,715 |
| 19977 | Smyrna | Delaware | 10,450 | $557,951 | $53,392 |
| 19938 | Clayton | Delaware | 4,030 | $214,247 | $53,163 |
| 19962 | Magnolia | Delaware | 5,150 | $273,476 | $53,102 |
| 19713 | Newark | Delaware | 15,350 | $757,659 | $49,359 |
| 19963 | Milford | Delaware | 9,180 | $448,380 | $48,843 |
| 19904 | Dover | Delaware | 15,640 | $762,809 | $48,773 |
| 19943 | Felton | Delaware | 5,420 | $260,286 | $48,023 |
| 19966 | Millsboro | Delaware | 12,290 | $585,259 | $47,621 |
| 19964 | Marydel | Delaware | 570 | $26,648 | $46,751 |
| 19703 | Claymont | Delaware | 7,080 | $330,165 | $46,633 |
| 19946 | Frederica | Delaware | 2,010 | $93,517 | $46,526 |
| 19973 | Seaford | Delaware | 11,120 | $514,724 | $46,288 |
| 19979 | Viola | Delaware | 380 | $17,577 | $46,255 |
| 19901 | Dover | Delaware | 14,920 | $683,456 | $45,808 |
| 19801 | Wilmington | Delaware | 6,270 | $284,228 | $45,331 |
| 19953 | Hartly | Delaware | 2,020 | $91,467 | $45,281 |
| 19933 | Bridgeville | Delaware | 4,130 | $185,283 | $44,863 |
| 19940 | Delmar | Delaware | 2,570 | $114,608 | $44,595 |
| 19720 | New Castle | Delaware | 28,430 | $1,260,485 | $44,336 |
| 19950 | Greenwood | Delaware | 3,110 | $137,852 | $44,325 |
| 19954 | Houston | Delaware | 740 | $32,665 | $44,142 |
| 19945 | Frankford | Delaware | 3,300 | $144,646 | $43,832 |
| 19804 | Wilmington | Delaware | 9,130 | $399,312 | $43,736 |
| 19952 | Harrington | Delaware | 4,780 | $204,811 | $42,847 |
| 19947 | Georgetown | Delaware | 7,930 | $331,343 | $41,783 |
| 19956 | Laurel | Delaware | 6,910 | $284,755 | $41,209 |
| 19960 | Lincoln | Delaware | 3,100 | $127,332 | $41,075 |
| 19805 | Wilmington | Delaware | 18,280 | $732,609 | $40,077 |
| 19802 | Wilmington | Delaware | 11,570 | $459,798 | $39,741 |
| 19941 | Ellendale | Delaware | 1,160 | $42,593 | $36,718 |