| Business | Phone |
| Devil's Postpile Natl Monument Devils Postpile Natl Monument, Mammoth Lakes 93546 | (760) 934-2289 |
| Mammoth Lakes Information Rcrd Mammoth Lakes 93546 | (760) 934-1094 |
| Mammoth Ranger District Center Highway 203, Mammoth Lakes 93546 | (760) 924-5500 |