You're never too far away from a clinic or post office in Yellowstone.

Medical Services There are three medical facilities in Yellowstone National Park:

• Mammoth Clinic is open year-round Oct. 1 – May 30, open Monday – Friday, 8:30 a.m. – 5 p.m. (closed for lunch 1-2 p.m.), closed Friday afternoons. June 1 – Sept. 30 open daily, 8:30 a.m. – 5 p.m. 307.344.7965.
• Lake Hospital is open May 19 – Sept. 30, open daily, 8:30 a.m. – 8:30 p.m., staff on call seven days a week as needed. 307.242.7241.
• Old Faithful Clinic hours differ depending on the time of the year. On May 6 – May 15, open daily 8:30 a.m. – 5 p.m. (closed for lunch noon – 1 p.m.) On May 16 – Sept. 15, it is open daily 7 a.m. – 7 p.m. (closed for lunch noon – 1 p.m.), with staff on call for life emergencies. On Sept. 16 – Oct. 17, open daily 8:30 a.m. – 5:00 p.m. (closed for lunch noon – 1 p.m.), with staff on call for life emergencies. 307.545.7325.

Post Offices
There are five post offices in Yellowstone National Park:

• Mammoth Hot Springs, open year-round excluding holidays, 8:30 a.m.-5 p.m. weekdays, closed Saturday and Sunday.
• Old Faithful, mid May-early October, and mid December-mid March.
• Grant Village, open mid May-mid Octtober.
• Lake Village, open mid May-mid October.
• Canyon Village, open late May-mid September.