Payroll to Tombstone (1959), Grave Near Tombstone (1959) and The Hanging (1959) all supposedly happened the same day: 8/12/1881.
Here are many businesses and services seen in Tombstone throughout the series. Some might have been mentioned in various episodes without being seen: Tombstone Courthouse; Tombstone Cafe; Tombstone Hospital; Al Hambra Saloon; Lucky Clain Saloon; Hafford's Saloon; Oriental Saloon, selling Buffalo Lager - signs outside the door; Russ House - Good Food and Lodging; Barber Shop - Shave 15 cents, Haircut 25 cents; Livery Stable and Blacksmith; Dressmaker; Undertaker and Funeral Parlor; Birdcage Theater; Bank; Stage Depot; American Hotel; Arcade Hotel; Cosmopolitan Hotel; Grand Hotel and Saloon; Hotel Occidental; Lenoir's Furniture Store, next door to the sheriff's office; Express Office; Hardware Store; Silver Lode Bank.