Home / Lowest measured density / Offices of physical, occupational & speech therapists
19 ZIP codes across 8 states have a published count of physical therapy statistically below the U.S. rate. States with none are omitted. Coverage is the counties on this site. Census ZBP 2023 + ACS 2024.
Includes: Physical therapy clinics · Occupational therapy offices · Speech therapy offices · Audiology offices. Counted together because official statistics use one 621340 code.
| State | Low ZIPs | Comparable | Lowest index | ZIP | City |
|---|---|---|---|---|---|
| Arizona | 1 | 89 | 45% | 85281 | Tempe |
| California | 4 | 411 | 38% | 91761 | Ontario |
| Florida | 1 | 318 | 45% | 33647 | Tampa |
| Illinois | 1 | 154 | 41% | 60608 | Chicago |
| New York | 6 | 233 | 35% | 11368 | Corona |
| Tennessee | 1 | 24 | 47% | 37211 | Nashville |
| Texas | 4 | 210 | 32% | 77084 | Houston |
| Virginia | 1 | 40 | 47% | 20171 | Herndon |
Scroll the table sideways to see all columns.
Low measured density is not evidence of opportunity. These are published counts that the Poisson test flags as below the U.S. rate. They are not a ranking of places to open. How the test works →
What does “lowest measured density” mean for physical therapy? A ZIP is listed only when Census published at least 5 physical therapy with paid employees, the ZIP has at least 10,000 residents, and a one-sided Poisson test finds the count statistically below the U.S. rate (p < 0.05). Index 100% is the national density per person present.
Is a low-density ZIP a place to open this kind of business? No. A low published count of physical therapy can mean weak demand, no suitable space, residents shopping near work, or businesses with no paid employees that Census ZBP does not count. Each line is a question to check locally, not a recommendation.
Why is a state missing from this list? A state page exists only when at least one ZIP in the counties we cover clears the same test as the radius search. We do not publish an empty list. Coverage is those counties, not the whole state.
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BizGapMap — free, no-login small-business saturation reports for major U.S. counties. Built entirely from public U.S. Census, BLS, and IRS data (ZBP 2023, ACS 2024 5-year, PEP 2024, LODES, QCEW, IRS SOI). No forecasts, no revenue guesses — withheld cells are marked, and the few derived counts are labelled as estimates.