Group I counties:
001 - Adair
003 - Alfalfa
005 - Atoka
007 - Beaver
009 - Beckham
011 - Blaine
013 - Bryan
015 - Caddo
017 - Canadian
019 - Carter
021 - Cherokee
023 - Choctaw
025 - Cimarron
027 - Cleveland
029 - Coal
031 - Comanche
033 - Cotton
035 - Craig
037 - Creek
039 - Custer
041 - Delaware
X01 - Dewey
045 - Ellis
047 - Garfield
049 - Garvin
051 - Grady
053 - Grant
055 - Greer
057 - Harmon
059 - Harper
061 - Haskell
063 - Hughes
065 - Jackson
067 - Jefferson
069 - Johnston
071 - Kay
073 - Kingfisher
075 - Kiowa
077 - Latimer
079 - Le Flore
081 - Lincoln
083 - Logan
085 - Love
087 - Major
089 - Marshall
091 - Mayes
093 - McClain
095 - McCurtain
097 - McIntosh
099 - Murray
101 - Muskogee
103 - Noble
105 - Nowata
107 - Okfuskee
109 - Oklahoma
111 - Okmulgee
113 - Osage
115 - Ottawa
117 - Pawnee
119 - Payne
121 - Pittsburg
123 - Pontotoc
125 - Pottawatomie
127 - Pushmataha
129 - Roger Mills
X03 - Rogers
133 - Seminole
135 - Sequoyah
137 - Stephens
141 - Texas
139 - Tillman
143 - Tulsa
145 - Wagoner
147 - Washington
149 - Washita
151 - Woods
153 - Woodward
Group II counties:
001 - Adair
003 - Alfalfa
005 - Atoka
007 - Beaver
009 - Beckham
011 - Blaine
013 - Bryan
015 - Caddo
017 - Canadian
019 - Carter
021 - Cherokee
023 - Choctaw
025 - Cimarron
027 - Cleveland
029 - Coal
031 - Comanche
033 - Cotton
035 - Craig
037 - Creek
039 - Custer
041 - Delaware
X01 - Dewey
045 - Ellis
047 - Garfield
049 - Garvin
051 - Grady
053 - Grant
055 - Greer
057 - Harmon
059 - Harper
061 - Haskell
063 - Hughes
065 - Jackson
067 - Jefferson
069 - Johnston
071 - Kay
073 - Kingfisher
075 - Kiowa
077 - Latimer
079 - Le Flore
081 - Lincoln
083 - Logan
085 - Love
087 - Major
089 - Marshall
091 - Mayes
093 - McClain
095 - McCurtain
097 - McIntosh
099 - Murray
101 - Muskogee
103 - Noble
105 - Nowata
107 - Okfuskee
109 - Oklahoma
111 - Okmulgee
113 - Osage
115 - Ottawa
117 - Pawnee
119 - Payne
121 - Pittsburg
123 - Pontotoc
125 - Pottawatomie
127 - Pushmataha
129 - Roger Mills
X03 - Rogers
133 - Seminole
135 - Sequoyah
137 - Stephens
141 - Texas
139 - Tillman
143 - Tulsa
145 - Wagoner
147 - Washington
149 - Washita
151 - Woods
153 - Woodward
Group III counties:
001 - Adair
003 - Alfalfa
005 - Atoka
007 - Beaver
009 - Beckham
011 - Blaine
013 - Bryan
015 - Caddo
017 - Canadian
019 - Carter
021 - Cherokee
023 - Choctaw
025 - Cimarron
027 - Cleveland
029 - Coal
031 - Comanche
033 - Cotton
035 - Craig
037 - Creek
039 - Custer
041 - Delaware
X01 - Dewey
045 - Ellis
047 - Garfield
049 - Garvin
051 - Grady
053 - Grant
055 - Greer
057 - Harmon
059 - Harper
061 - Haskell
063 - Hughes
065 - Jackson
067 - Jefferson
069 - Johnston
071 - Kay
073 - Kingfisher
075 - Kiowa
077 - Latimer
079 - Le Flore
081 - Lincoln
083 - Logan
085 - Love
087 - Major
089 - Marshall
091 - Mayes
093 - McClain
095 - McCurtain
097 - McIntosh
099 - Murray
101 - Muskogee
103 - Noble
105 - Nowata
107 - Okfuskee
109 - Oklahoma
111 - Okmulgee
113 - Osage
115 - Ottawa
117 - Pawnee
119 - Payne
121 - Pittsburg
123 - Pontotoc
125 - Pottawatomie
127 - Pushmataha
129 - Roger Mills
X03 - Rogers
133 - Seminole
135 - Sequoyah
137 - Stephens
141 - Texas
139 - Tillman
143 - Tulsa
145 - Wagoner
147 - Washington
149 - Washita
151 - Woods
153 - Woodward