Table 1. Demographics of Zip Codes by Vaccination Rate.
| Characteristic | Residents, No. (%) | P valuea | ||
|---|---|---|---|---|
| Least vaccinated quartile (n = 619 518) | Middle 25%-75% (n = 1 582 146) | Most vaccinated quartile (n = 484 691) | ||
| Zip code population with ≥1 dose by March 28, 2021, % | 22 | 33 | 43 | NA |
| Age, yb | ||||
| 0-17 | 151 766 (24) | 350 272 (22) | 59 282 (12) | <.001 |
| 18-64 | 374 758 (60) | 1 046 275 (66) | 369 739 (76) | |
| ≥65 | 92 994 (15) | 185 599 (12) | 55 670 (11) | |
| Median (IQR) | 36 (34-40) | 34 (33-38) | 33 (32-37) | .26 |
| Sex | ||||
| Women | 337 097 (54) | 797 669 (50) | 243 892 (50) | <.001 |
| Men | 282 421 (46) | 784 477 (50) | 240 799 (50) | |
| Race/ethnicity | ||||
| Hispanic or Latino | 80 974 (13) | 638 721 (40) | 54 243 (11) | <.001 |
| Non-Hispanic or Latino | ||||
| Asian | 4103 (1) | 121 594 (8) | 49 523 (10) | |
| Black | 498 263 (80) | 246 648 (16) | 39 005 (8) | |
| White | 27 914 (5) | 538 835 (34) | 327 806 (68) | |
| Otherc | 8264 (1) | 36 348 (2) | 14 114 (3) | |
| ≥High school graduated | 336 956 (83) | 883 791 (82) | 361 664 (95) | <.001 |
| With health insurancee | 557 180 (91) | 1 385 479 (89) | 459 730 (96) | <.001 |
| Household income, median (IQR), $ | 34 535 (26 900-38 955) | 53 864 (45 335-70 547) | 94 859 (93 989-111 438) | .04 |
Abbreviation: NA, not appliable.
χ2 tests were used to compare distributions of age (df = 4), sex (df = 2), and race and ethnicity (df = 8) across all 3 groups. High school graduates and health insurance were compared across all groups using analysis of variance (df = 2). Median age and household income were compared across all groups using a Kruskal-Wallis test (df = 2).
Total number across the group (percentage of group population).
May include individuals identifying as American Indian or Alaska Native.
Percentages are calculated among group population older than 25 years. Least vaccinated quartile, 405 693 residents; middle quartiles, 1 074 983 residents; and most vaccinated quartile, 378 753 residents.
Percentages are calculated among group civilian noninstitutionalized population. Least vaccinated quartile, 615 196 residents; middle quartiles, 1 564 004 residents; and most vaccinated quartile, 480 514 residents.