Idaho Code § 31-140
Payette county is described as follows: beginning at the intersection of the north line of township nine (9) north, range five (5) west, with the west line of the state of Idaho, said intersection being the southwest corner of Washington county;
Northern boundary. Thence east a distance of twenty-two (22) miles, more or less, to the northwest corner of section three (3), township nine (9) north, range one (1) west;
Eastern boundary. Thence south on section line six (6) miles, to the southeast corner of section thirty-three (33), said township and range; thence west on the township line between townships eight (8) and nine (9) north, four (4) miles to the northwest corner of section one (1), township eight (8) north, range two (2) west; thence south on section line four (4) miles, to the southwest corner of section twenty-four (24), said township and range; thence west on section line two (2) miles, to the northwest corner of section twenty-seven (27), said township and range; thence south on section line two (2) miles, to the southeast corner of section thirty-three (33), said township and range; thence west on township line between townships seven (7) and eight (8), seven (7) miles, to the southwest corner of section thirty-three (33), township eight (8) north, range three (3) west; thence south on section line twelve (12) miles, to the southwest corner of section thirty-three (33), township six (6) north, range three (3) west;
Southern boundary. Thence west on township line between townships five (5) and six (6), two (2) miles to the southwest corner of section thirty-one (31), township six (6) north, range three (3) west; thence south on range line between ranges three (3) and four (4), one-half (1/2) mile to the east quarter corner of section one (1), township five (5) north, range four (4) west; thence west along the center line of sections one (1) and two (2), said township and range, two (2) miles to the east quarter corner of section three (3), said township and range; thence south along the section line one-half (1/2) mile, to the southeast corner of section three (3), said township and range; thence west along the section line three (3) miles, to the southwest corner of section five (5), said township and range; thence north along the section line one (1) mile, to the northwest corner of section five (5), said township and range; thence west along the township line between townships five (5) and six (6) north, two (2) miles, to the southwest corner of section thirty-six (36), township six (6) north, range five (5) west; thence north along the section line one (1) mile, to the northwest corner of section thirty-six (36), said township and range; thence west along the section line one (1) mile, to the southwest corner of section twenty-six (26), said township and range; thence north along the section line one (1) mile, to the southwest corner of section twenty-three (23), said township and range; thence west along the section line two (2) miles, to the southwest corner of section twenty-one (21), said township and range; thence north along the section line three (3) miles, to the northwest corner of section nine (9), said township and range; thence west along the section line one and one-half (1 1/2) miles, more or less, to an intersection with the west line of the state of Idaho;
Western boundary. Thence in a northerly direction, following the said west boundary line of the state of Idaho, to the point of beginning.
County seat-Payette.
Idaho Code § 31-140