3679 Duderstadt Rd is located in Harper, Texas, in Gillespie County. Gillespie County is the cultural and commercial heart of the Texas Hill Country, anchored by Fredericksburg, a city founded by German immigrants in 1846 whose heritage is still visible in the architecture, festivals, and cuisine. The county is one of the top wine-producing regions in Texas, with over 50 wineries drawing millions of visitors annually.

The Pedernales River originates in Gillespie County and flows eastward through rolling granite and limestone hills covered in live oak, juniper, and peach orchards. Enchanted Rock, a massive pink granite dome, rises 425 feet above the surrounding terrain in the northern part of the county.

Harper had an estimated population of 1,199 as of 2023. The 78631 zip code has a median household income of $73,646, a median home value of $339,100, and a median age of 42.1. The average household size is 2.91 people.

Wine tourism, peach farming, agritourism, ranching, and a thriving retail and hospitality sector in Fredericksburg drive the county economy. Gillespie County consistently ranks among the fastest-growing rural counties in Texas, attracting buyers seeking vineyard estates, ranch retreats, and Hill Country lifestyle properties.