Which counties have the roughest roads?

FHWA's road-condition records show poor ride quality (above 170 inches per mile of roughness) on 89.1% of measured road miles in District of Columbia, DC, 74.1% in Baltimore city, MD and 65.4% in Marion County, WV, against 13.8% in the median county.

District of Columbia, DC89.1%

Baltimore city, MD74.1%

Marion County, WV65.4%

Harrison County, WV60.4%

Putnam County, WV58.7%

Cabell County, WV55.8%

Jefferson County, WV55.7%

Mercer County, WV55.3%

Wood County, WV53.8%

New Castle County, DE51.9%

What it shows: District of Columbia, DC is the largest at 89.1%, followed by Baltimore city, MD at 74.1%; the smallest shown is New Castle County, DE at 51.9%.

Source: FHWA Highway Performance Monitoring System (HPMS) national section data, roughness (IRI) by county; poor-ride cut from the FHWA Conditions and Performance Report · data from 2026