Service Area

Serving Monroe County,
Southern Illinois &
St. Louis

Mary C. Neff is dual-licensed in Missouri and Illinois — which means she's the right attorney whether you're in Waterloo, Belleville, or St. Louis. One attorney. Both states. Full representation.

Areas Served

Deep local knowledge on both sides of the river.

Monroe County, Illinois

Mary's home. She knows Monroe County courts, their procedures, and their judges. This is where she practices with the deepest roots.

Waterloo, Illinois

The Monroe County seat. Mary regularly appears in Waterloo courts for divorce, custody, and family law proceedings.

Belleville, Illinois

St. Clair County's largest city — Mary provides full family law representation in Belleville and the surrounding area.

St. Clair County, Illinois

O'Fallon, Fairview Heights, and the broader St. Clair County — Illinois family law with dual-licensed depth.

Madison County, Illinois

Edwardsville, Alton, Granite City — Madison County clients have access to full-spectrum Illinois family law representation.

St. Louis, Missouri

Missouri-licensed. Mary represents St. Louis metro clients in divorce, custody, mediation, and family law — on both sides of the river.

Why Dual Licensure Matters

Many families in the St. Louis metro live in Illinois and work in Missouri — or vice versa. A divorce, custody dispute, or paternity matter may involve the law of one or both states. Mary's dual licensure means you don't have to hire two attorneys. You get one attorney who knows both systems — and has practiced in both for over 13 years.

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Or call: (314) 454-9100