Counties that contain no national-level routes

[epzik8]

I can think of four U.S. counties that don't have any U.S. or Interstate highways: Calvert, Caroline and St. Mary's counties in Maryland, and Mathews County, Virginia. Carroll County, Maryland is an almost-example; I-70/U.S. 40 cut its southwest corner in the area of Mount Airy.

Any other examples?

[Roadsguy]

I think Cameron County is Pennsylvania's only example.

[paulthemapguy]

Illinois has a bunch in rather remote areas--state highways only.  Calhoun, Hardin, and Gallatin counties spring to mind immediately.  There are a lot of counties in the Great Plains states that have one or two north-south state routes and one or two east-west state routes, but no US or Interstate.

This is a very common occurrence west of the Appalachians, I think you'll find.

[kphoger]

Illinois has a bunch in rather remote areas--state highways only.  Calhoun, Hardin, and Gallatin counties spring to mind immediately. 

US-45 crosses into Gallatin County along that pretty stretch through the river bottoms between Eldorado and Norris.

[froggie]

^^ Even east of the Appalachians, you'll find several.  Besides the OP's mention of Mathews County, there's also Charles City, Craig, Dickenson, and Westmoreland Counties in VA as well as the City of Poquoson.

Lamoille County, VT

Piscataquis County, ME

Dukes and Nantucket Counties, MA

Newport County, RI

[BrianP]

Cumberland County, NJ: US 40 just misses it.

[Brandon]

Illinois has a bunch in rather remote areas--state highways only.  Calhoun, Hardin, and Gallatin counties spring to mind immediately. 

US-45 crosses into Gallatin County along that pretty stretch through the river bottoms between Eldorado and Norris.

Yep, just nicks it.  However, for Illinois, there are:
Hardin, Pope, Edwards, Wabash, Crawford, Randolph, Calhoun, Stark, and Menard Counties.

Moutrie County gets the eastbound lane of US-36.  Putnam County gets the tail end of I-180.  Jasper County gets nicked by US-40 (but not I-70).

[BrianP]

I think Cameron County is Pennsylvania's only example.

Historically it used to have US 120. 

[CNGL-Leudimin]

All counties of Hawaii except Honolulu.

[ilpt4u]

Illinois has a bunch in rather remote areas--state highways only.  Calhoun, Hardin, and Gallatin counties spring to mind immediately. 

US-45 crosses into Gallatin County along that pretty stretch through the river bottoms between Eldorado and Norris.

Yep, just nicks it.  However, for Illinois, there are:
Hardin, Pope, Edwards, Wabash, Crawford, Randolph, Calhoun, Stark, and Menard Counties.

Moutrie County gets the eastbound lane of US-36.  Putnam County gets the tail end of I-180.  Jasper County gets nicked by US-40 (but not I-70).

I'll have to look, but do decommissioned US Routes in IL make any changes?

I doubt US 66 would make a change, as I-55 is pretty much a direct replacement. Do former US 54 and US 460 make any dents on that list? They had interstate replacements, but not quite as 1:1 as 66:55

[frankenroad]

Off the top of my head....Several in Michigan....Luce, Leelenau, Huron, Tuscola, Sanilac.   In Ohio, Morgan County.

I suspect there are more, both in these and other states.

[kphoger]

US-45 crosses into Gallatin County along that pretty stretch through the river bottoms between Eldorado and Norris.

Yep, just nicks it. 

1.35 miles, according to the reference marker at the north end.

[wriddle082]

Every county in South Carolina is served by, at a minimum, two US highways.  Though the average square mileage of a SC county is probably twice that of a GA county, and I would venture to guess that nearly a quarter of GA's counties aren't served by I- or US- routes.

[Brandon]

Illinois has a bunch in rather remote areas--state highways only.  Calhoun, Hardin, and Gallatin counties spring to mind immediately. 

US-45 crosses into Gallatin County along that pretty stretch through the river bottoms between Eldorado and Norris.

Yep, just nicks it.  However, for Illinois, there are:
Hardin, Pope, Edwards, Wabash, Crawford, Randolph, Calhoun, Stark, and Menard Counties.

Moutrie County gets the eastbound lane of US-36.  Putnam County gets the tail end of I-180.  Jasper County gets nicked by US-40 (but not I-70).

I'll have to look, but do decommissioned US Routes in IL make any changes?

I doubt US 66 would make a change, as I-55 is pretty much a direct replacement. Do former US 54 and US 460 make any dents on that list? They had interstate replacements, but not quite as 1:1 as 66:55

Only US-460 for Hamilton County (which I should've included on the list of no US or I routes currently).

[US 89]

Wayne County, UT is the only one in Utah without any sort of interstate or US highway. Colorado appears to have 7: Crowley, Custer, Gilpin, Hinsdale, Pitkin, Rio Blanco, and San Miguel.

Every county in Nevada has an interstate or US highway. Storey comes closest to not having one, but I-80 just nicks the northeast corner of it.

This got me curious, how many of these counties had I actually visited? Turns out, of the 305 counties I've been to, only 3 meet this criteria: Santa Cruz CA, Grimes TX, and Wayne UT.

[ce929wax]

I'm thinking Newaygo County in Michigan doesn't have any US or Interstate Highways in it.  US 131 comes within a mile or so of Newaygo County.  Oscoda and Montmorency counties also fit the bill.

[jp the roadgeek]

^^ Even east of the Appalachians, you'll find several.  Besides the OP's mention of Mathews County, there's also Charles City, Craig, Dickenson, and Westmoreland Counties in VA as well as the City of Poquoson.

Lamoille County, VT

Piscataquis County, ME

Dukes and Nantucket Counties, MA

Newport County, RI

Bristol County, RI too. 

[sparker]

In CA:  Trinity, Alpine, Butte, Sutter, Lake, Amador, Calaveras, Mariposa, and Tulare counties contain no Interstate or U.S. highways.  I-80 barely "nicks" into far-flung corners of both Napa and Sierra counties.

For an exercise examining the opposite concept, there's a handful of CA counties that have all three types of highways:  Riverside (US 95), San Bernardino (US 95 & 395), Los Angeles (US 101), Santa Clara, San Mateo, San Francisco, and Marin (all containing US 101 and at least one Interstate), Sacramento, Yolo (both US 50), and Siskiyou (US 97).  Of course in post '64 CA, US routes are a bit hard to come by!   

[TheHighwayMan3561]

MN has Lake and Cook which were historically served by US 61 but no longer.

[GaryV]

Add Missaukee to the Michigan list

[ilpt4u]

Until veryrecently, Monroe County IN, would have qualified. But now with I-69, no more

In spite of IN 37 between Indy and Paoli being part of the old Dixie Highway, that segment did not get a US Highway Designation

[Thing 342]

You can add Craig, Dickenson, and Westmoreland to the VA list.
Stretching the definition a bit, you could also add the cities of Poquoson, Manassas, Manassas Park and (I think) Falls Church, as they're independent cities.

[cl94]

New York has several. Hamilton, Lewis, Orleans, Schuyler, Tompkins, Wayne, and Yates (7/62) have no US routes or Interstates. Chenango and Delaware are clipped by I-88, Sullivan is clipped by US 209, Tioga has less than 1/2 mile of I-86. Wyoming County only has an alternate (US 20A). Chemung and Tioga got their only federally-designated route (I-86) within the past decade or so.

[pdx-wanderer]

Wallowa, Polk and Yamhill, OR.

Skamania and Wahkiakum WA.

[kphoger]

Kansas
Greeley (K-96, K-27)
Wichita (K-96, K-25)
Lane (K-96, K-23, K-4)