Stephen P. Walters of Lower Milford, a Democrat, is running for a Lehigh County Commissioner seat from District 5, according to an unofficial voter registration list.

It is the most competitive field in the county commissioner district races.

Walters and one other Democrat are running for one District 5 seat in the party's primary and four Republicans are running for one District 5 seat in the primary, according to the unofficial list.

Here are the candidates:

DISTRICT 5 (Emmaus, Macungie, Upper Milford, Lower Milford, Coopersburg, Upper Saucon and parts of Allentown)

Republican

Nathan Brown, of Emmaus

Norma A Cusick, of Salisbury Township

Kevin P. Ryan, of Upper Milford

Incumbent Michael P. Schware, of Allentown

Democrat

Wesley Barrett, of Emmaus

Stephen P. Walters, of Lower Milford

DISTRICT 4 (Part of Allentown)

Geoffrey Brace, of Allentown

DISTRICT 3 (Part of Bethlehem and Allentown, Fountain Hill, Catasauqua and Hanover)

Democrat

Incumbent David Jones, of Allentown

Juan Camacho, of Allentown

DISTRICT 2 (South Whitehall, Lower Macungie, Upper Macungie and Alburtis)

Democrat

Susan Ellis Wild

Republican

Incumbent Percy Dougherty, of Lower Macungie

Scott Aquila, of Lower Macungie

DISTRICT 1 (North Whitehall, Weisenberg, Lynn, Heidleberg, Washington, Lowhill, Slatington, Whitehall and Coplay)

Republican

Incumbent Tom Creighton, of Lynn Township

Democrat

Bill Leiner, of Coplay

The primary is May 21.