There is a partial list: http:en.wikipedia.orgwikiNuclear_we ... ted_States

Some were well inland:

Fallon, Nevada

Green Valley, Colorado - The aim of Project Rulison was to determine if natural gas could be easily liberated from underground regions. The test had a yield of 43-kilotons. After the test, the natural gas that was extracted was determined to be too radioactive to be sold commercially.

Rifle, Colorado - The Rio Blanco test site had three simultaneously detonated 30 kiloton bombs, each at the bottom of a shaft more than a mile deep.

Hattiesburg, Mississippi - Two nuclear detonations performed in a subterranean salt dome formation, as part of a 1960's Atomic Energy Commission Test. The first detonation, to form the cavity, code-named Salmon, took place in 1964 using a 5.3 kiloton bomb, placed at the bottom of a sealed 2,710-foot shaft. The second nuclear blast, a relatively small 0.38 kilotons yield shot code-named Sterling, was exploded within Salmon's 110-foot diameter cavity more than two years later.