Littleton Opera House Share: Wedding & Event Littleton Opera House Visit Website 2 Union Street Littleton, NH 03561 603-575-5324 About Map About Littleton Opera House is available for venue rentals for any occasion. We can assist in planning events, large or small. Our Grand Hall has a seating capacity of 434 and our Tower Room space can hold up to 55 pp for smaller events, and meetings. What's Nearby? Distance: 5 10 15 20 25 50 mi.