ODNR Division of Mineral Resources Management - Oil and Gas

County Codes - Oil and Gas Well Search 

Each county in Ohio is assigned a county number for reference purposes. Be sure to include all three digits of the county number in your search.

COUNTY NUMBER
COUNTY NAME
 
COUNTY NUMBER
COUNTY NAME

001

Adams

 

089

Licking

003

Allen

 

091

Logan

005

Ashland

 

093

Lorain

007

Ashtabula

 

095

Lucas

009

Athens

 

097

Madison

011

Auglaize

 

099

Mahoning

013

Belmont

 

101

Marion

015

Brown

 

103

Medina

017

Butler

 

105

Meigs

019

Carroll

 

107

Mercer

021

Champaign

 

109

Miami

023

Clark

 

111

Monroe

025

Clermont

 

113

Montgomery

027

Clinton

 

115

Morgan

029

Columbiana

 

117

Morrow

031

Coshocton

 

119

Muskingum

033

Crawford

 

121

Noble

035

Cuyahoga

 

123

Ottawa

037

Darke

 

125

Paulding

039

Definance

 

127

Perry

041

Delaware

 

129

Pickaway

043

Erie

 

131

Pike

045

Fairfield

 

133

Portage

047

Fayette

 

135

Preble

049

Franklin

 

137

Putnam

051

Fulton

 

139

Richland

053

Gallia

 

141

Ross

055

Geauga

 

143

Sandusky

057

Green

 

145

Scioto

059

Guernsey

 

147

Seneca

061

Hamilton

 

149

Shelby

063

Hancock

 

151

Stark

065

Hardin

 

153

Summit

067

Harrison

 

155

Trumbull

069

Henry

 

157

Tuscarawas

071

Highland

 

159

Union

073

Hocking

 

161

Van Wert

075

Holmes

 

163

Vinton

077

Huron

 

165

Warren

079

Jackson

 

167

Washington

081

Jefferson

 

169

Wayne

083

Knox

 

171

Williams

085

Lake

 

173

Wood

087

Lawrence

 

175

Wyandot