Looking on the internet deeply has found these results:

in the hospital is the most popular phrase on the web.

at the hospital 13,710,000 results on the web	in the hospital 138,700,000 results on the web More popular!
Some examples and use cases from the internet:	Some examples and use cases from the internet:
Please correct me if I'm wrong, but isn't it so that a doctor is at the hospital (he ... A person might have tests done at the hospital, but if he stays overnight he is in�... In the United States, we usually say in the hospital and at the hospital. A person is at the hospital when he is physically on the premises of the�... Sep 11, 2014 ... Ebola Outbreak. Dying of Ebola at the Hospital Door ... Speaks About Ebola Epidemic � Now Playing. Dying of Ebola at the Hospital Door�... Night at the Hospital is Team Snugglebunny's visual novel entry for the Pulse Pounding Heart Stopping Dating Sim Jam of 2013 (PPHS). The first release was �...	But luther says she's in the hospital. You put a police officer in the hospital. I heard she's in the hospital. We found Oswal, he was in the hospital. The monster left Sarah recovering in the hospital. He was so thoughtful when your grandfather was in the hospital. Wilson was undergoing psychiatric treatment in the hospital. I didn't even know she was in the hospital until her parents called.

at the hospital

13,710,000 results on the web

in the hospital

138,700,000 results on the web

More popular!

Please correct me if I'm wrong, but isn't it so that a doctor is at the hospital (he ... A person might have tests done at the hospital, but if he stays overnight he is in�...
In the United States, we usually say in the hospital and at the hospital. A person is at the hospital when he is physically on the premises of the�...
Sep 11, 2014 ... Ebola Outbreak. Dying of Ebola at the Hospital Door ... Speaks About Ebola Epidemic � Now Playing. Dying of Ebola at the Hospital Door�...
Night at the Hospital is Team Snugglebunny's visual novel entry for the Pulse Pounding Heart Stopping Dating Sim Jam of 2013 (PPHS). The first release was �...