Green Mercantile Store, general store and post office in Buffalo Creek, Colorado

The Green Mercantile Store is a two-story building of native granite in Buffalo Creek, Colorado, constructed in 1898 by John W. Green, Sr. It has housed a general store and the Buffalo Creek post office continuously since then, and remains operated by descendants of the Green family.

The original Green Mercantile was a wooden hotel building put up in 1883 and bought by John Wesley Green. In 1886 Green became Buffalo Creek's postmaster, appointed by Grover Cleveland, and the store took on the post office. A fire in 1897 destroyed that building and many others in Buffalo Creek; Green then hired the Seerie Investment Company to rebuild in fireproof native granite, finished in 1898.

The post office has operated inside the store since 1886, when Grover Cleveland appointed John Wesley Green postmaster; the Green family's descendants still run both the general store and the post office. The building has stayed in continuous use for that dual purpose since 1898.

The store stands in Buffalo Creek, not Aspen Park, and the post office operates inside the same granite building, so mail and general goods share one address. The structure is two stories of native granite block; the source does not describe interior stairs or upper-floor access, so visitors should not assume a separate entrance or lift.

The granite blocks were so heavy that it took six men with a mule team and a special lifting device called a gin pole to position each stone during construction. This hands-on building method reveals how construction workers solved practical problems without modern machinery.