| 901 | CONNIE 26 | Weld County, CO | Oil & Gas Property | May 2026 |
| 902 | CONOCO | Fremont County, CO | Oil Property | May 2026 |
| 903 | CONOCO FEDERAL | Jackson County, CO | Oil & Gas Property | Jul 2013 |
| 904 | CONOCO-FEDERAL | Jackson County, CO | Oil & Gas Property | May 2026 |
| 905 | CONRAD | Yuma County, CO | Gas Property | May 2026 |
| 906 | CONRAD | La Plata County, CO | Gas Property | May 2026 |
| 907 | CONRAD FEDERAL | Weld County, CO | Oil & Gas Property | Oct 2016 |
| 908 | CONRAD FEDERAL | Yuma County, CO | Gas Property | May 2026 |
| 909 | CONRAD STATE | Yuma County, CO | Gas Property | May 2026 |
| 910 | CONSTITUTION FEDERAL LC21-6 | Weld County, CO | Oil & Gas Property | May 2026 |
| 911 | CONTINENTAL | Rio Blanco County, CO | Oil & Gas Property | Jul 2022 |
| 912 | COOK | Weld County, CO | Oil & Gas Property | Jan 2018 |
| 913 | COOK | Yuma County, CO | Gas Property | May 2026 |
| 914 | COOK | Baca County, CO | Gas Property | May 2026 |
| 915 | COOK | Garfield County, CO | Oil & Gas Property | May 2026 |
| 916 | COOK | Weld County, CO | Oil & Gas Property | May 2026 |
| 917 | COOK R | Garfield County, CO | Oil & Gas Property | May 2026 |
| 918 | COOLEY | Weld County, CO | Oil & Gas Property | Jun 2019 |
| 919 | COOPER 23-1 | Weld County, CO | Oil & Gas Property | Apr 2018 |
| 920 | COORDES | Adams County, CO | Oil & Gas Property | Nov 2022 |
| 921 | COORS | Rio Blanco County, CO | Oil & Gas Property | Jul 2022 |
| 922 | COORS | Weld County, CO | Oil & Gas Property | Nov 2020 |
| 923 | COORS ENERGY | Weld County, CO | Oil & Gas Property | Apr 2021 |
| 924 | COPPERHEAD 2 | Weld County, CO | Oil & Gas Property | May 2026 |
| 925 | CORBIN | Weld County, CO | Oil & Gas Property | Dec 2018 |
| 926 | CORNISH | Weld County, CO | Oil & Gas Property | Aug 2025 |
| 927 | CORRAL CREEK | Rio Blanco County, CO | Oil & Gas Property | May 2026 |
| 928 | COSSLETT | Weld County, CO | Oil & Gas Property | May 2026 |
| 929 | COSSLETT | Weld County, CO | Oil & Gas Property | May 2026 |
| 930 | COSSLETT EAST FEDERAL 1A-22H-H168 | Weld County, CO | Oil & Gas Property | May 2026 |
| 931 | COSSLETT HEIRS UU | Weld County, CO | Oil & Gas Property | Apr 2019 |
| 932 | COSTIGAN | Weld County, CO | Oil & Gas Property | Feb 2023 |
| 933 | COT EAST | Weld County, CO | Oil & Gas Property | May 2026 |
| 934 | COT WEST | Weld County, CO | Oil & Gas Property | May 2026 |
| 935 | COTNER 35-14 | Garfield County, CO | Oil & Gas Property | May 2026 |
| 936 | COTTONWOOD | Weld County, CO | Oil & Gas Property | Jan 2021 |
| 937 | COTTONWOOD | Weld County, CO | Oil & Gas Property | Mar 2025 |
| 938 | COTTONWOOD CREEK 4-65 2 | Arapahoe County, CO | Oil & Gas Property | May 2026 |
| 939 | COTTONWOOD GULCH | Moffat County, CO | Oil & Gas Property | Apr 2025 |
| 940 | COUCH 01-16U | La Plata County, CO | Gas Property | May 2026 |
| 941 | COUEY | Garfield County, CO | Oil & Gas Property | May 2026 |
| 942 | COUEY FEDERAL | Garfield County, CO | Oil & Gas Property | May 2026 |
| 943 | COUFAL | Weld County, CO | Oil & Gas Property | Apr 2017 |
| 944 | COUGAR B 02-6 | Weld County, CO | Oil & Gas Property | May 2026 |
| 945 | COULSON 2 | Weld County, CO | Oil & Gas Property | Oct 2019 |
| 946 | COUNTER | Weld County, CO | Oil & Gas Property | Oct 2023 |
| 947 | COUNTY LINE 3 | Weld County, CO | Oil & Gas Property | May 2026 |
| 948 | COUNTYLINE 0508-1 | Weld County, CO | Oil & Gas Property | May 2026 |
| 949 | COURTNEY | Weld County, CO | Oil & Gas Property | Jul 2014 |
| 950 | COW SKULL 11-89-18 | Gunnison County, CO | Gas Property | May 2026 |
| 951 | COWBOY 21 | Weld County, CO | Oil & Gas Property | May 2026 |
| 952 | COWLES | Washington County, CO | Oil Property | May 2026 |
| 953 | COX 1161 | Weld County, CO | Oil & Gas Property | Aug 2020 |
| 954 | COX 34 | Yuma County, CO | Gas Property | May 2026 |
| 955 | COX 5 | Weld County, CO | Oil & Gas Property | May 2026 |
| 956 | COX CANYON | La Plata County, CO | Gas Property | Oct 2016 |
| 957 | COX S | Cheyenne County, CO | Gas Property | Nov 2004 |
| 958 | COYLE | Weld County, CO | Oil & Gas Property | Feb 2024 |
| 959 | COYOTE FED 0397-14 | Moffat County, CO | Oil & Gas Property | May 2026 |
| 960 | COYOTE TRAILS 3 | Weld County, CO | Oil & Gas Property | May 2026 |
| 961 | COZZENS | Weld County, CO | Oil & Gas Property | May 2026 |
| 962 | CPC-BOHLENDER | Weld County, CO | Oil & Gas Property | Sep 2020 |
| 963 | CRADER | La Plata County, CO | Gas Property | Apr 2026 |
| 964 | CRAIG | La Plata County, CO | Gas Property | May 2026 |
| 965 | CRAIG | Weld County, CO | Oil & Gas Property | May 2026 |
| 966 | CRAIG | Lincoln County, CO | Oil & Gas Property | Mar 2026 |
| 967 | CRAIG | Garfield County, CO | Oil & Gas Property | May 2026 |
| 968 | CRANDELL | Broomfield County, CO | Oil & Gas Property | May 2026 |
| 969 | CRANMER | Yuma County, CO | Gas Property | May 2026 |
| 970 | CRAVEN | Weld County, CO | Oil & Gas Property | May 2026 |
| 971 | CRAWFORD | Weld County, CO | Oil & Gas Property | May 2026 |
| 972 | CREAM | Weld County, CO | Oil & Gas Property | May 2026 |
| 973 | CREAM STATE 2 | Weld County, CO | Oil & Gas Property | May 2026 |
| 974 | CREEK 29-01 | La Plata County, CO | Gas Property | May 2026 |
| 975 | CRICKET C22-3 | Weld County, CO | Oil & Gas Property | Sep 2016 |
| 976 | CRISWELL | Washington County, CO | Oil & Gas Property | Sep 2014 |
| 977 | CRITTER CREEK | Weld County, CO | Oil & Gas Property | May 2026 |
| 978 | CRITTER CREEK | Weld County, CO | Oil & Gas Property | Apr 2026 |
| 979 | CROISSANT | Weld County, CO | Oil & Gas Property | Feb 2023 |
| 980 | CROISSANT | Weld County, CO | Oil & Gas Property | Feb 2014 |
| 981 | CROISSANT | Weld County, CO | Oil & Gas Property | Oct 2018 |
| 982 | CRONE | Morgan County, CO | Oil & Gas Property | May 2021 |
| 983 | CRONK 1 | Washington County, CO | Oil Property | Mar 2026 |
| 984 | CROSBY | Cheyenne County, CO | Oil Property | May 2026 |
| 985 | CROSSLAND | Yuma County, CO | Gas Property | May 2026 |
| 986 | CROSSLAND | Yuma County, CO | Gas Property | May 2026 |
| 987 | CROW 3-64 29-30-25 | Adams County, CO | Oil & Gas Property | May 2026 |
| 988 | CROW CREEK | Weld County, CO | Oil & Gas Property | May 2026 |
| 989 | CROW VALLEY | Weld County, CO | Oil & Gas Property | May 2026 |
| 990 | CROWDER | Weld County, CO | Oil & Gas Property | May 2026 |
| 991 | CRUICKSHANK | Weld County, CO | Oil & Gas Property | May 2026 |
| 992 | CRYSTAL 6-65 22-10 | Elbert County, CO | Oil & Gas Property | May 2026 |
| 993 | CS-KINKADE | Weld County, CO | Oil & Gas Property | May 2026 |
| 994 | CS-LONGMEADOW | Weld County, CO | Oil & Gas Property | May 2026 |
| 995 | CS-SCOTT | Weld County, CO | Oil & Gas Property | May 2026 |
| 996 | CS-SHERWOOD | Weld County, CO | Oil & Gas Property | May 2026 |
| 997 | CSF 1 | Garfield County, CO | Oil & Gas Property | May 2026 |
| 998 | CSF 2 | Garfield County, CO | Oil & Gas Property | May 2026 |
| 999 | CSF 3 | Garfield County, CO | Oil & Gas Property | May 2026 |
| 1000 | CSF 4 | Garfield County, CO | Oil & Gas Property | May 2026 |