According to the ATF database, there are 4 registered FFLs in New Haven, Missouri.
1201 OLIVE RDNEW HAVEN, MO, 63068
4723 HWY 185NEW HAVEN, MO, 63068
4517 ORCHARD RDNEW HAVEN, MO, 630680000
4520 PRAIRIE FORK RDNEW HAVEN, MO, 63068