I see in another comment that Manchester was full, and you were going to try Bedford, if that doesn't work you can also try the Nashua Human Society, or the Concord SPCA. One of them might be able to assist with taking in a stray. You can also fill out a found report.

Concord SPCA Found Pet: https://www.popememorialspca.org/lost-pets
Nashua Humane Society: https://www.hsfn.org/animal-services/lost-found-pets/ (have to mail or fax)
Bedford: https://www.rescueleague.org/lost-and-found

On a side note, I had to do a double take, this looks a lot like my cat, but she is sleeping next to me, and I'm a long way away.
Cat Tax: https://i.imgur.com/biI0vcD.png