One-county state highways

[Thing 342]

VA 162 is the only one I can think of off the top of my head.

[Molandfreak]

Southern MN 101 ends at the Scott county line; there's a gap where southern 101 was a continuous route between the 212 freeway and MN 5, which is now Carver county 101. Now, the "middle segment" begins at MN 5 and ends before it curves and becomes Townline Road, so there's no cheating by saying the southbound lanes travel through Hennepin county for a while before it ends. Thus, two out of the three MN 101's are completely intracounty, within the same county (Carver County).

[Takumi]

VA 162 is the only one I can think of off the top of my head.

VA's entire list is on page 3.

[Beeper1]

Here is the list for Rhode Island.  A state where counties are pretty much non-existant anyway.
Asterisk means the route does cross a state line.

PROVIDENCE COUNTY:
RI-7
RI-10
RI-12
RI-15*
RI-94
RI-96*
RI-98*
RI-99
RI-100
RI-101*
RI-103A
RI-104
RI-107
RI-114A*
RI-120*
RI-121*
RI-122*
RI-123*
RI-126*
RI-128
RI-146*
RI-146A*
RI-152*
RI-246

NEWPORT COUNTY:
RI-24*
RI-77
RI-81*
RI-138A
RI-177*
RI-179
RI-214
RI-238

WASHINGTON COUNTY:
RI-78*
RI-91
RI-108
RI-110
RI-112
RI-165
RI-216*

KENT COUNTY:
RI-113
RI-118
RI-401

BRISTOL COUNTY:
RI-136*

[Avalanchez71]

Florida has a lot. Off the top of my head: 3, 5A, 423, 424, 437, 438, 441, 482, 539, 540, 542, 544, 548, 551, 552, 553...
[/quote
826
836
9A
992
9336
997
902

I can go on and on.

[rarnold]

Idaho does not have a lot of state highways, but many of those are contained in one county.

SH-4 - Shoshone
SH-5 - Benewah
SH-7 - Clearwater
SH-9 - Latah
SH-13 - Idaho
SH-14 - Idaho
SH-29 - Lemhi
SH-37 - Power
SH-38 - Oneida
SH-40 - Bannock
SH-43 - Bonneville
SH-47 - Fremont
SH-53 - Kootenai
SH-54 - Kootenai
SH-57 - Bonner
SH-58 - Kootenai
SH-60 - Benewah
SH-61 - Bear Lake
SH-62 - Lewis
SH-64 - Lewis (3 miles of route is gravel, hugging the side of a mountain, barely one lane, no guardrails)
SH-66 - Latah
SH-69 - Ada
SH-72 - Payette
SH-74 - Twin Falls
SH-77 - Cassia
SH-79 - Jerome
SH-87 - Fremont
SH-97 - Harrison
SH-99 - Latah
SH-128 - Nez Perce
SH-200 - Bonner

Probably would have been easier to list the routes that entered more than one county, but where is the fun in that.

[thenetwork]

Medina County, OH (my old stompin' ground) is one of dozens of counties in Ohio with one-county state highways.

BTW, SR 421 and SR 606 are the ones in Medina Co.

[route56]

Here's what I have for active single-county highways in Kansas

Allen County: 202* 203* 224*
Atchison County: 74*
Barber County: 8 (South)**
Brown County: 246
Bourbon County: 65
Cherokee County: 26* 66** 102 103*
Cheyenne County: 161** 217*
Clay County: 80*
Cloud County:  189*
Coffey County: 131*
Comanche County: 1
Cowley County: 360*
Crawford County: 126** 171**
Doniphan County: 120 136* 137* 238*
Dickinson County: 43 197* 206* 218*
Ellis County: 247* 255*
Ellsworth County: 111 141
Geary County: 157 244*
Graham County: 84* 85*
Greenwood County: 249*
Gove County: 211* 212* 216*
Harper County: 179**
Jackson County: 79* 214*
Jefferson County: 76* (slated to be turned back) 237*
Jewell County: 112* 228*
Labette County: 101
Lincoln County: 252* 284*
Linn County: 52 152 239
Lyon County: 78*
Marshall County: 110* 233*
Marion County: 168* 215* 256*
McPherson County: 86* 89* 153* 260*
Meade County: 98
Miami County: 279*
Mitchell County: 193* 194*
Morris County: 149
Nemaha County: 71* 87 88* 178* 187 236*
Norton County: 60* 67* 173* 261*
Osage County: 268 276* 278* 368*
Ottawa County: 41* 106
Pawnee County: 264*
Phillips County: 121*
Pratt County: 64*
Rawlins County: 117**
Republic County: 139 199* 266
Riley County: 113* 114*
Rooks County: 258*
Saline County: 104* 143*
Scott County: 95*
Sedgwick County: 251
Sheridan County: 188
Sherman County: 253* 267*
Smith County: 8 (North)* ** 182* 191* 204* 248*
Sumner County: 53 205* 210* 271*
Thomas County: 184* 186*
Trego County: 198*
Washington County: 22* 115* 119* 234* 243*
Wabaunsee County: 30* 138* 185* 195*
Wichita County: 167*
Woodson County: 105

* Less than 5 miles long
** connects to a highway in an adjacent state

[PHLBOS]

Essex County, MA:

22
35
97 in Massachusetts
114
127
127A
129A
213

I realize that you're fairly new to this site/forum (welcome aboard); however, those were already mentioned a page or two back in this thread.  See PurdueBill's Reply #60 (to deathtopumpkins earlier reply) in the below-link.

https://www.aaroads.com/forum/index.php?topic=8133.50

[mgk920]

Another one I can think of is WI 116, entirely in Winnebago County.

The now decommissioned WI 150 was also entirely in Winnebago County.

A couple of more for the list for within Wisconsin:

MN 23
I-535
(both entirely within Douglas County)

Mike

[Thing 342]

Surprised nobody has mentioned DC-295 yet.

[NE2]

Surprised nobody has mentioned DC-295 yet.

like oh my god me too

D.C. 295 and its northern continuation into Prince George's County, Maryland, Route 201.

[hotdogPi]

This time, nobody has mentioned it.

Barnstable County, MA.

Routes here:

6 and 28 go into other counties.

Only in Barnstable County: 6A, 28A, 39, 124, 130, 132, 134, 139, 149, 151

(Edited to show that it's Massachusetts.)

[US71]

AR 400
AR 170 (2 separate roads, both in the same county)
AR 399
AR 219
AR 282
AR 264 (multiple roads, all in the same county)
AR 255
AR 253
AR 143
AR 221
AR 392
AR 397
AR 206
AR 186

Probably lots more, but that's all that come to mind, off-hand.

[formulanone]

Florida

Palm Beach County - 704, 706, 708, 715, 717, 786, 794, 800, 802, 804, 806, 808, 812, 880 (SR?)
Broward County - 736, 810, 814, 816, 818, 820, 822, 824, 828, 834, 844, 848, 858
Miami-Dade - 94, 112, 856, 860, 874, 878, 913 (SR?), 924, 922, 932, 934, 953, 970, 972, 986, 994
Martin - 76, 714
Collier - 951
Alachua - 24A, 26A, 120, 222, 331
Bradford - 230

[Kacie Jane]

Doesn't look like anyone has done Washington yet.  Unfortunately, I'm only really familiar with Puget Sound, and I'm too lazy to look at a map.

Whatcom: 539, 542, 543, 544, 546, 547, 548
Skagit: 534, 536, 538
Snohomish: 92, 96, 204, 524, 526, 528, 531
King: 18, 164, 169, 181, 513, 515, 516, 518, 519, 520, 523, 599, 908*
Pierce: 161, 163**, 165, 512, 702, 704, I-705, 706

*Apparently, SR 908 died in 2010, but it's still on the BGSs on I-405 (haven't been on the route itself recently).  Likewise, SR 527 is now technically only in Snohomish County, but it's still signed into downtown Bothell in King County.
**Except for the ferry terminal on Vashon Island (King)

[CNGL-Leudimin]

A couple of more for the list for within Wisconsin:

MN 23
I-535
(both entirely within Douglas County)

Mike

Both enter Minnesota (Especially MN-23 since it's from MN), and thus enter more than one county.

BTW: I-97

[hotdogPi]

Rockingham County, NH:
1A in New Hampshire
1B
33
43
84
85
87
88
97 in New Hampshire
121 except ~100 feet
150 in New Hampshire
151
286 in New Hampshire

This does not count various routes with A after them.

[PHLBOS]

Suffolk County, MA: 145

[Interstatefan78]

Warren County,NJ
RT-57
Union county,NJ
RT-439
Passaic County,NJ
RT-20
Middlesex County,NJ
RT-26
RT-91
RT-171
RT-172
Northampton County,PA
PA-512
PA-946