| 301 | SLUGGER | La Plata County, CO | Gas Property | Jan 2025 |
| 302 | SLW GREEN STATE BB 18 | Weld County, CO | Oil & Gas Property | Feb 2021 |
| 303 | SLW RANCH | Weld County, CO | Oil & Gas Property | Dec 2024 |
| 304 | SLW STATE | Weld County, CO | Oil & Gas Property | Jun 2021 |
| 305 | SMALL | Washington County, CO | Gas Property | Dec 2024 |
| 306 | SMALL EYED | Weld County, CO | Oil & Gas Property | Jan 2025 |
| 307 | SMART | Logan County, CO | Oil & Gas Property | Feb 2009 |
| 308 | SMITH | Yuma County, CO | Oil & Gas Property | Jan 2025 |
| 309 | SMITH | Weld County, CO | Oil & Gas Property | Oct 2016 |
| 310 | SMITH | La Plata County, CO | Gas Property | Dec 2024 |
| 311 | SMITH 2 | Yuma County, CO | Gas Property | Jan 2025 |
| 312 | SMITH A 1 | La Plata County, CO | Gas Property | Dec 2024 |
| 313 | SMITH FEDERAL | La Plata County, CO | Gas Property | Dec 2024 |
| 314 | SMITH STATE LD12-7 | Weld County, CO | Oil & Gas Property | Dec 2024 |
| 315 | SMITH-WOLTER | La Plata County, CO | Gas Property | Dec 2024 |
| 316 | SMITS | Weld County, CO | Oil & Gas Property | Apr 2020 |
| 317 | SNIFF | Bent County, CO | Oil & Gas Property | Dec 2024 |
| 318 | SNOOK | La Plata County, CO | Gas Property | Dec 2024 |
| 319 | SNOOKS A | La Plata County, CO | Gas Property | Dec 2024 |
| 320 | SNOW KING | Lincoln County, CO | Oil & Gas Property | Jan 2025 |
| 321 | SNOWBIRD | Lincoln County, CO | Oil & Gas Property | Jan 2025 |
| 322 | SNOWMASS | Weld County, CO | Oil & Gas Property | Dec 2024 |
| 323 | SNYDER | Garfield County, CO | Oil & Gas Property | Dec 2024 |
| 324 | SNYDER | Garfield County, CO | Oil & Gas Property | Dec 2024 |
| 325 | SO UTE | La Plata County, CO | Gas Property | Dec 2024 |
| 326 | SO UTE | La Plata County, CO | Gas Property | Dec 2024 |
| 327 | SO UTE | La Plata County, CO | Gas Property | Dec 2024 |
| 328 | SO UTE | La Plata County, CO | Gas Property | Dec 2024 |
| 329 | SO UTE 3 | La Plata County, CO | Gas Property | Dec 2024 |
| 330 | SO UTE FC 34 | La Plata County, CO | Gas Property | Dec 2024 |
| 331 | SO.UTE | La Plata County, CO | Gas Property | Dec 2024 |
| 332 | SO.UTE FC 33-11 1 | La Plata County, CO | Gas Property | Dec 2024 |
| 333 | SOC STATE 145 | Yuma County, CO | Oil & Gas Property | Jan 2025 |
| 334 | SOCO 20 | Weld County, CO | Oil & Gas Property | Jul 2019 |
| 335 | SOCO 29 | Weld County, CO | Oil & Gas Property | Jan 2020 |
| 336 | SOEHNER | Yuma County, CO | Gas Property | Jan 2025 |
| 337 | SOEHNER | Yuma County, CO | Gas Property | Jan 2025 |
| 338 | SOLDIER CANYON | Garfield County, CO | Gas Property | Jan 2025 |
| 339 | SOLMAN/CALPHA | Yuma County, CO | Gas Property | Jan 2025 |
| 340 | SOLVAY CHEMICALS | Garfield County, CO | Oil & Gas Property | Dec 2024 |
| 341 | SOLVAY GM | Garfield County, CO | Oil & Gas Property | Dec 2024 |
| 342 | SOME-STATE 1 | Logan County, CO | Oil Property | Dec 2024 |
| 343 | SONIC STAR | Weld County, CO | Oil & Gas Property | Dec 2024 |
| 344 | SOONER | Weld County, CO | Oil & Gas Property | Jul 2019 |
| 345 | SOOUTHERN UTE 302 | La Plata County, CO | Gas Property | Dec 2024 |
| 346 | SORENSSON | Weld County, CO | Oil & Gas Property | Mar 2023 |
| 347 | SORIN NATURAL RESOURCES 2 | Weld County, CO | Oil & Gas Property | Dec 2024 |
| 348 | SOSA | Weld County, CO | Oil & Gas Property | May 2018 |
| 349 | SOURS | Garfield County, CO | Oil & Gas Property | Dec 2024 |
| 350 | SOUTE | La Plata County, CO | Gas Property | Dec 2024 |
| 351 | SOUTE | La Plata County, CO | Gas Property | Dec 2024 |
| 352 | SOUTE | La Plata County, CO | Oil & Gas Property | Dec 2024 |
| 353 | SOUTE 32 | La Plata County, CO | Gas Property | Sep 2016 |
| 354 | SOUTE 32-1 | La Plata County, CO | Gas Property | May 2019 |
| 355 | SOUTE FC 3 | La Plata County, CO | Gas Property | Dec 2024 |
| 356 | SOUTE FC 34 | La Plata County, CO | Gas Property | Dec 2024 |
| 357 | SOUTH 6-2 | Weld County, CO | Oil & Gas Property | Jun 2017 |
| 358 | SOUTH BAXTER PASS | Garfield County, CO | Gas Property | May 2009 |
| 359 | SOUTH CANYON-FEDERAL | Garfield County, CO | Oil & Gas Property | Dec 2024 |
| 360 | SOUTH DOUGLAS CREEK | Rio Blanco County, CO | Gas Property | Dec 2024 |
| 361 | SOUTH GATE 8-4 | Weld County, CO | Oil & Gas Property | Jun 2022 |
| 362 | SOUTH LEVERICH 1 | Garfield County, CO | Oil & Gas Property | Dec 2024 |
| 363 | SOUTH LOST CREEK | Weld County, CO | Oil & Gas Property | Jan 2025 |
| 364 | SOUTH SHALE RIDGE | Mesa County, CO | Gas Property | Jan 2025 |
| 365 | SOUTHARD | Weld County, CO | Oil & Gas Property | Dec 2020 |
| 366 | SOUTHERN | La Plata County, CO | Oil & Gas Property | Jan 2025 |
| 367 | SOUTHERN FC 33-6 6-1 | La Plata County, CO | Gas Property | Dec 2024 |
| 368 | SOUTHERN U | La Plata County, CO | Oil & Gas Property | Dec 2024 |
| 369 | SOUTHERN UT | La Plata County, CO | Oil & Gas Property | Jan 2025 |
| 370 | SOUTHERN UTE | La Plata County, CO | Oil & Gas Property | Jan 2025 |
| 371 | SOUTHERN UTE | La Plata County, CO | Gas Property | Dec 2024 |
| 372 | SOUTHERN UTE | La Plata County, CO | Gas Property | Jan 2025 |
| 373 | SOUTHERN UTE | La Plata County, CO | Gas Property | Dec 2024 |
| 374 | SOUTHERN UTE F.C 34-9 31-9 | La Plata County, CO | Gas Property | Dec 2024 |
| 375 | SOUTHWEST RANGELY | Rio Blanco County, CO | Gas Property | Jul 2024 |
| 376 | SOWER FEDERAL | La Plata County, CO | Gas Property | Dec 2024 |
| 377 | SPADE | Weld County, CO | Oil & Gas Property | Jul 2024 |
| 378 | SPANISH FORK | La Plata County, CO | Gas Property | Dec 2024 |
| 379 | SPARBOE | Weld County, CO | Oil & Gas Property | Jan 2025 |
| 380 | SPARGO | Dolores County, CO | Oil & Gas Property | Dec 2024 |
| 381 | SPARKS B | La Plata County, CO | Gas Property | Dec 2024 |
| 382 | SPAULDING PEAK 1294 2 | Delta County, CO | Oil & Gas Property | Sep 2008 |
| 383 | SPAULDING, MARGARET | Jackson County, CO | Oil Property | Oct 2013 |
| 384 | SPAUR | Weld County, CO | Oil & Gas Property | Jan 2025 |
| 385 | SPAUR 31 | Weld County, CO | Oil & Gas Property | Dec 2024 |
| 386 | SPAUR BROTHERS EH 31 | Weld County, CO | Oil & Gas Property | Dec 2024 |
| 387 | SPAYD | Weld County, CO | Oil & Gas Property | Jun 2020 |
| 388 | SPEAK FED | Weld County, CO | Oil & Gas Property | Jan 2025 |
| 389 | SPEAKER | Cheyenne County, CO | Oil & Gas Property | Jan 2025 |
| 390 | SPEAKER | Weld County, CO | Oil & Gas Property | Oct 2024 |
| 391 | SPECIALTY | Garfield County, CO | Oil & Gas Property | Dec 2024 |
| 392 | SPECIALTY RESTAUR | Garfield County, CO | Oil & Gas Property | Dec 2024 |
| 393 | SPENCER 21 | Weld County, CO | Oil & Gas Property | Nov 2019 |
| 394 | SPIKE | Weld County, CO | Oil & Gas Property | Nov 2016 |
| 395 | SPIKE ST | Weld County, CO | Oil & Gas Property | Nov 2020 |
| 396 | SPIKE ST | Weld County, CO | Oil & Gas Property | Aug 2022 |
| 397 | SPIKE ST | Weld County, CO | Oil & Gas Property | Jan 2024 |
| 398 | SPIKE STATE CC 6 | Weld County, CO | Oil & Gas Property | Oct 2016 |
| 399 | SPINNEY 0 | Weld County, CO | Oil & Gas Property | Dec 2024 |
| 400 | SPOMER | Weld County, CO | Oil & Gas Property | Jul 2019 |