Idaho Code § 31-124
Fremont county is described as follows: beginning at a point where the northern boundary of the state of Idaho intersects the range line between ranges thirty (30) and thirty-one (31) east;
Northern boundary. Thence easterly along the northern boundary of the state of Idaho to a point where said boundary line intersects the western boundary of the state of Wyoming (R.C., section 23l);
Eastern boundary. Thence south along the dividing line between Idaho and Wyoming to the point where said dividing line intersects with the North Fork of Bitch creek;
Southern boundary. Thence westerly and down said Bitch creek to where the same intersects the main channel of Teton river; thence down the center of the main channel of said Teton river, to where the same intersects the range line between ranges forty-one (41) and forty-two (42) east; thence south to the township line between townships six (6) and seven (7) north; thence west to the southeast corner of section thirty-five (35), township seven (7) north, range forty (40) east; thence north one (1) mile to the northeast corner of section thirty-five (35); thence west to the northeast corner of section thirty-four (34), township seven (7) north, range thirty-nine (39) east; thence north two (2) miles to the northeast corner of section twenty-two (22), township and range last aforesaid; thence west to the northeast corner of section twenty-one (21), township seven (7) north, range thirty-eight (38) east (1913, ch. 26, section 2, pp. 108, 109); thence north on said section line between said sections twenty-one (21) and twenty-two (22), township and range last aforesaid, to the northeast corner of section four (4), township seven (7) north, range thirty-eight (38) east; thence west nine (9) miles to the southeast corner of township eight (8) north, range thirty-six (36) east; thence north six (6) miles to the northeast corner of said township eight (8) north, range thirty-six (36) east; thence west on the township line between townships eight (8) and nine (9) north, thirty (30) miles to the northeast corner of township eight (8) north, range thirty-one (31) east; thence south six (6) miles to the southeast corner of said township eight (8) north, range thirty-one (31) east; thence west on the township line between townships seven (7) and eight (8) north, to a point on said township line north of the Big Southern Butte (1913, ch. 25, section 2, pp. 95, 96);
Western boundary. Thence north to the point where the line thus drawn intersects the township line between townships ten (10) and eleven (11) north; thence east along said township line to the southwest corner of township eleven (11) north, range thirty-one (31) east; thence north along the range line between ranges thirty (30) and thirty-one (31) east, to the place of beginning (R.C., section 23p).
County seat-St. Anthony.
Idaho Code § 31-124