Value explorer / IA
IA: the directory by county and ZIP
- 45,558
- practitioners
- 47.1%
- have a workplace
- 13,345
- provider organizations
- 788
- tax records (not added)
- 100
- counties
The bar is the share with a workplace listed, not the number of practitioners. Ranking by headcount would just rank by population.
| County | Practitioners | Has a workplace | Provider orgs | Tax records | ZIPs |
|---|---|---|---|---|---|
| +Polk County | 10,108 | 42.1% | 2,698 | 100 | 28 |
| +Johnson County | 7,362 | 44.8% | 673 | 27 | 12 |
| +Linn County | 3,373 | 45.6% | 923 | 35 | 16 |
| +Scott County | 2,903 | 47.6% | 796 | 33 | 11 |
| +Black Hawk County | 1,689 | 46.4% | 511 | 25 | 8 |
| +Dubuque County | 1,480 | 42.9% | 416 | 31 | 11 |
| +Story County | 1,423 | 48.5% | 288 | 13 | 11 |
| +Woodbury County | 1,228 | 39.2% | 402 | 26 | 16 |
| +Cerro Gordo County | 1,150 | 57.7% | 274 | 13 | 4 |
| +Pottawattamie County | 1,042 | 58.1% | 288 | 15 | 8 |
| +Wapello County | 971 | 72.1% | 177 | 4 | 5 |
| +Des Moines County | 607 | 54.4% | 178 | 11 | 4 |
| +Clinton County | 595 | 36.1% | 226 | 10 | 6 |
| +Sioux County | 590 | 61.4% | 164 | 18 | 7 |
| +Clay County | 495 | 54.3% | 115 | 6 | 2 |
| +Marion County | 479 | 54.1% | 127 | 11 | 6 |
| +Fayette County | 455 | 77.8% | 91 | 7 | 8 |
| +Webster County | 445 | 31.7% | 213 | 13 | 5 |
| +Bremer County | 430 | 49.1% | 104 | 7 | 5 |
| +Muscatine County | 425 | 51.8% | 123 | 7 | 3 |
| +Dallas County | 357 | 51.0% | 162 | 10 | 9 |
| +Marshall County | 327 | 26.0% | 105 | 9 | 3 |
| +Mahaska County | 254 | 48.8% | 68 | 5 | 3 |
| +Carroll County | 243 | 44.0% | 98 | 6 | 5 |
| +Page County | 242 | 55.8% | 115 | 8 | 4 |
| +Boone County | 222 | 55.9% | 68 | 5 | 3 |
| +Humboldt County | 221 | 81.4% | 70 | 2 | 2 |
| +Jasper County | 213 | 41.8% | 126 | 9 | 5 |
| +Appanoose County | 213 | 74.6% | 87 | 6 | 3 |
| +Warren County | 211 | 37.9% | 88 | 6 | 3 |
| +Cass County | 199 | 44.2% | 65 | 4 | 4 |
| +Buchanan County | 192 | 55.2% | 66 | 8 | 4 |
| +Lee County | 187 | 34.2% | 130 | 7 | 5 |
| +Plymouth County | 184 | 54.9% | 76 | 10 | 5 |
| +Crawford County | 183 | 67.2% | 78 | 8 | 3 |
| +Winneshiek County | 173 | 32.4% | 63 | 3 | 4 |
| +Jefferson County | 173 | 41.0% | 121 | 7 | 2 |
| +Wright County | 171 | 71.9% | 79 | 7 | 4 |
| +Buena Vista County | 161 | 42.2% | 73 | 3 | 4 |
| +Poweshiek County | 159 | 50.9% | 84 | 9 | 3 |
| +Union County | 157 | 58.0% | 50 | 3 | 2 |
| +Washington County | 137 | 41.6% | 90 | 6 | 4 |
| +Shelby County | 136 | 59.6% | 59 | 3 | 4 |
| +Dickinson County | 133 | 47.4% | 99 | 7 | 5 |
| +Greene County | 132 | 70.5% | 67 | 5 | 1 |
| +Jones County | 128 | 59.4% | 72 | 7 | 4 |
| +O'Brien County | 126 | 51.6% | 67 | 6 | 6 |
| +Jackson County | 123 | 39.8% | 69 | 9 | 4 |
| +Henry County | 118 | 39.0% | 96 | 4 | 4 |
| +Benton County | 113 | 36.3% | 74 | 7 | 9 |
| +Montgomery County | 112 | 42.0% | 59 | 6 | 3 |
| +Tama County | 110 | 59.1% | 43 | 6 | 6 |
| +Cherokee County | 108 | 38.9% | 60 | 8 | 3 |
| +Delaware County | 105 | 61.0% | 60 | 6 | 4 |
| +(county unknown) | 97 | 11.3% | 12 | 1 | 24 |
| +Lucas County | 96 | 50.0% | 31 | 1 | 1 |
| +Allamakee County | 93 | 49.5% | 34 | 5 | 5 |
| +Iowa County | 89 | 49.4% | 54 | 5 | 6 |
| +Kossuth County | 83 | 45.8% | 47 | 7 | 7 |
| +Madison County | 82 | 54.9% | 48 | 5 | 3 |
| +Hardin County | 77 | 40.3% | 55 | 6 | 5 |
| +Floyd County | 74 | 55.4% | 59 | 5 | 3 |
| +Harrison County | 74 | 39.2% | 58 | 3 | 6 |
| +Emmet County | 70 | 24.3% | 46 | 2 | 3 |
| +Monona County | 69 | 49.3% | 44 | 5 | 4 |
| +Calhoun County | 67 | 40.3% | 45 | 3 | 3 |
| +Decatur County | 66 | 33.3% | 40 | 4 | 3 |
| +Palo Alto County | 64 | 37.5% | 40 | 5 | 3 |
| +Monroe County | 63 | 65.1% | 28 | 1 | 1 |
| +Lyon County | 62 | 72.6% | 33 | 3 | 5 |
| +Grundy County | 61 | 67.2% | 45 | 3 | 5 |
| +Wayne County | 60 | 71.7% | 31 | 3 | 2 |
| +Guthrie County | 60 | 43.3% | 47 | 7 | 3 |
| +Clayton County | 56 | 55.4% | 71 | 5 | 8 |
| +Howard County | 54 | 44.4% | 36 | 3 | 3 |
| +Cedar County | 53 | 54.7% | 34 | 4 | 6 |
| +Keokuk County | 53 | 60.4% | 52 | 2 | 3 |
| +Winnebago County | 50 | 48.0% | 60 | 5 | 4 |
| +Chickasaw County | 46 | 39.1% | 35 | 3 | 4 |
| +Sac County | 41 | 46.3% | 42 | 4 | 4 |
| +Mills County | 41 | 19.5% | 37 | 3 | 3 |
| +Taylor County | 39 | 66.7% | 32 | 1 | 3 |
| +Clarke County | 37 | 29.7% | 41 | 2 | 2 |
| +Hancock County | 36 | 44.4% | 27 | 3 | 3 |
| +Ida County | 36 | 50.0% | 33 | 3 | 3 |
| +Mitchell County | 35 | 54.3% | 36 | 7 | 5 |
| +Davis County | 35 | 48.6% | 26 | 2 | 1 |
| +Hamilton County | 30 | 20.0% | 35 | 2 | 3 |
| +Louisa County | 28 | 42.9% | 22 | 3 | 4 |
| +Adair County | 24 | 29.2% | 31 | 3 | 3 |
| +Franklin County | 24 | 33.3% | 98 | 3 | 2 |
| +Butler County | 23 | 56.5% | 35 | 6 | 7 |
| +Audubon County | 22 | 22.7% | 27 | 3 | 2 |
| +Pocahontas County | 22 | 36.4% | 38 | 4 | 4 |
| +Van Buren County | 21 | 76.2% | 26 | 2 | 5 |
| +Ringgold County | 20 | 45.0% | 31 | 4 | 2 |
| +Fremont County | 20 | 65.0% | 18 | 4 | 4 |
| +Adams County | 19 | 10.5% | 20 | 2 | 1 |
| +Osceola County | 10 | 60.0% | 21 | 2 | 2 |
| +Worth County | 3 | 33.3% | 10 | 2 | 2 |
By profession, statewide
| Profession | Practitioners | Has a workplace |
|---|---|---|
| physician | 11,128 | 69.6% |
| behavioral-health | 8,964 | 34.3% |
| advanced-practice | 6,845 | 78.6% |
| rehab-therapy | 6,021 | 30.8% |
| pharmacy | 3,267 | 9.5% |
| dental | 2,318 | 18.2% |
| chiropractic | 1,960 | 52.6% |
| nursing | 1,750 | 23.5% |
| eye-vision | 704 | 66.6% |
| student | 687 | 8.3% |
| dietary | 620 | 22.4% |
| other-clinical | 448 | 30.8% |
| group | 267 | 70.0% |
| podiatry | 241 | 73.4% |
| support | 175 | 14.9% |
| no-taxonomy | 68 | 17.6% |
| facility | 36 | 36.1% |
| supplier | 21 | 9.5% |
| emergency-medical | 21 | 52.4% |
| agency | 10 | 10.0% |
| transport | 7 | 28.6% |
Release 2026-10-07. Methodology 0.7.3-draft.
Counts come from the NDH bulk export at the release named above. Organizations are split by record type and never summed: roughly half the Organization file is `ein` tax records that carry an NPI and an address, so adding them to provider organizations roughly doubles the count. Practitioner geography uses the primary address; 14.85% of practitioners list addresses in more than one state and are counted only in the first. Counties are derived from the Census ZCTA-to-county relationship file, taking the county holding the largest share of a ZIP's population; ZIPs with no dominant county are grouped as unknown. Payer organizations carry no address at all and cannot appear in any geography. Profession categories here come from the directory's own Practitioner.qualification taxonomy, not from NPPES. H54 categorises the same practitioners against their NPPES taxonomy and lands 1 to 2 points different per profession as a result: PA physicians read 73.0% here and 74.3% there. Neither is wrong. This view describes what the directory says about itself, which is the right frame for a directory explorer; H54 asks how the directory compares to the federal registry.
Data as JSON: /api/v1/explorer/ia.json. Looking for one provider? Search by name or NPI.