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Farm to Market Road 3504 or FM 3504 is the highway number applied to a short stretch of roadway in Lewisville, Texas that is now classified as an Urban Road by the Texas Department of Transportation. Locally known as Mill Street, UR 3504 is relatively obscure in the Texas highways system, as it carries only three marker signs: two at each junction and one on the actual roadway when proceeding north from TX 121. In addition, this road does not cover the entire Mill Street segment; the portion north of UR 1171 is locally maintained and not part of the highway.
Originally designated as a spur of then-FM 1171, UR 3504's four lanes provide access from downtown Lewisville to TX 121. A variety of older businesses and a school dot the road, making it more like an urban street than a typical state highway.
FM 1171 in Lewisville
TX 121 in Lewisville
