In Confinio Comitatus Law and Legal Definition

In confinio comitatus means within the boundary of the county.

If the cause of action arises in two counties, an action may be brought in either county; but if a nuisance be erected in one county to the damage of a man in another, the assize must be brought in confinio comitatuum. [Worster v. Winnipiseogee Lake Co., 25 N.H. 525, 533 (N.H. 1852)].