I believe it is all of them. (It should be) *edit* n North America hitchhiking is forbidden in some areas, such as near prisons. In some cases, a local government, such as New York City[1] where hitchhiking is widely considered very dangerous, may ban it altogether. Certain US states have created conditional bans, such as Utah, Pennsylvania, New Jersey and Nevada; it is frequently illegal on the actual shoulder of Interstate highways, but is usually legal from highway on-ramps. Nevada, for instance, bans hitchhiking, or signaling for a ride, altogether, but walking on rural interstates is permitted. The same law applies in Wyoming. On the other hand, the state of Oregon (with the exception of counties in the tri-met bus system--Clackamas, Multnomah, and Washington) permits the freedom of hitchhiking as well as walking right on the Interstate. Oklahoma, for instance only expressly bans pedestrians and hikers on tolled interstates-the free ones are 'ok', provided one is in a safe area for cars to briefly pull over. Many Canadian highways similarly have hitchhiking bans. Areas which do not permit pedestrian traffic (such as limited-access highways) are typically by implication off-limits to hitchhikers, even in the absence of laws directly addressing hitchhiking itself. Roads and their segments signed or otherwise designated as no-stopping zones are also de facto prohibiting hitchhiking since vehicles cannot legally stop to pick up hitchhikers, even if pedestrians are not prohibited.

Hitch-hiking is forbidden on all interstate systems in the United States.

Pennsylvania

Hitchiking is trictly forbidden on any interstate highway. Can you imagine how many people would be killed, trying to hitch a ride on the interstate, if it were not against the law? The homeless would take over and be run over.

missouri is still legal to hike. iowa u have to walk backwards so you dont get blindsided. at least thats what the trooper told me. ~Nomad~

Let's hear it for Oregon!!! The last truly FREE State!!! I was born, raised & live in Oregon and have always had the absolute Freedom to go anywhere in my State that I desired, with very few Restrictions. You can literally walk around the whole State - from the Pacific Ocean over to the Idaho Border and from the Columbia River south to the California Border. :)

1) "In most states you can't hitch from the interstates (motorways) themselves, but you can always stand at on-ramps (highway entries) like in Europe. In some areas (such as certain towns or municipal areas) hitching is illegal everywhere, however, it is still allowed de facto. The police in a region may interpret laws related to hitchhiking differently, at times forcing a hitchhiker to choose an alternate route by walking or using other means of transportation. In most cases, though, hitchhiking is legal or tolerated as long as you are not on the interstate itself, where it is rightly considered a safety issue. There are also many limited-access highways (i.e. with on-ramps and off-ramps) that are not part of the interstate system; these typically prohibit hitchhiking as well (other than at the on-ramp). It's generally easier to hitchhike on the West Coast. In Oregon, it's not even prohibited by law to hitchhike right on interstates." "Often, particularly close to major cities, the police will ask you for photo ID, but as long as you have one with you (such as a passport) there shouldn't be a problem. Most of the time they will be friendly when you come up clean, sometimes even driving you to a better spot. In most states, such as New Jersey, Virginia and New York State, on the East Coast and Nevada and Arizona in the West, there are laws against hitchhiking that are possible to be circumnavigated. Most often, the laws state that the hitchhiker may not "solicit a ride" in any way, i.e. showing a sign or a thumb to traffic. The police could ticket you for loitering or vagrancy. If the police passes and sees a hitchhiker walking or sitting by the side of the road without soliciting in any way, they may still stop to check IDs but technically they have no reason to pull you over. As a result, the best result is to not use a sign or your thumb whenever an oncoming car looks like a police cruiser. The laws are enforced because of "traffic safety" reasons mostly but in reality police rarely gives tickets to hitchhikers - they just check IDs for warrants whenever possible." Source and further information: http://hitchwiki.org/en/United_States 2) "The six that have the mot stringent laws against hitchhiking are Hawaii, Maine, Nevada, New Jersey, North Dakota and Wyoming." Source and further information: http://news.google.com/newspapers?nid=888&dat=19750622&id=9-gNAAAAIBAJ&sjid=pXkDAAAAIBAJ&pg=5630,4164972 (this information is from 1975, though...) 3) " Hitchhiking may be illegal in some areas or on certain types of roads. Enforcement of laws against hitchhiking may vary. Ask locals." Source and further information: http://www.articlesbase.com/travel-tips-articles/backpacker-tips-find-rides-for-free-1258236.html