Siena is one of northeast Round Rock's largest master-planned communities: about 3,000 homes on both sides of County Road 110, just north of US 79 and a mile from SH 130. It has Round Rock addresses, but it sits outside city limits, is served by Hutto ISD and pays into one of two Siena municipal utility districts. Those three facts shape almost every conversation we have with Siena buyers and sellers.
Jorgenson Real Estate has helped clients buy and sell more than 30 homes in Siena. Every pin is a Siena home our brokerage closed, and the map updates on its own as new sales close.
Adding every 2025 taxing unit on Siena homes in county records gives about $2.30 per $100 in Siena MUD No. 1 and about $2.38 per $100 in Siena MUD No. 2, before homestead and other exemptions (Williamson County, county road, Hutto ISD, an emergency services district, East Williamson County Higher Education Center, Upper Brushy Creek WCID and the MUD). Check the exact bill on wcad.org.
Siena's amenity center includes an exercise room, a large pool, splash pad, basketball and sand volleyball courts, with hike-and-bike trails through the community. The HOA is Siena Master Community, Inc.; ask for the resale certificate early to see dues and any transfer fees for a specific home.
SH 130 is about a mile east and US 79 runs just south. Approximate drives: Old Settlers Park about 3 miles, Dell Diamond about 4 miles, Ascension Seton Williamson about 5 miles, Kalahari about 5 miles, Dell headquarters about 8 miles. The Old Settlers Blvd extension to CR 110 adds another route toward central Round Rock.
Buyers comparing Siena with newer communities weigh the Hutto ISD zoning and MUD taxes against the amenities and location near SH 130, so we spell those out up front. Sellers: we price from recent Siena sales on your side of the community and handle photos, signs and launch. Start with a free market analysis.
More on MUDs, homestead exemptions and Texas contracts in our Central Texas real estate FAQ.
No. Siena has Round Rock (78665) addresses but sits in Round Rock's extraterritorial jurisdiction, so there is no city property tax. Utilities were built through Siena MUD No. 1 and No. 2.
Hutto ISD. For 2026-27 homes are zoned to Kerley Elementary or Veterans Hill Elementary, then Gus Almquist Middle, the Ninth Grade Center and Hutto High. Confirm any address with the district.
About $2.30 per $100 in Siena MUD No. 1 and about $2.38 per $100 in Siena MUD No. 2 for 2025, before exemptions.
An amenity center with exercise room, pool, splash pad, basketball and sand volleyball courts, plus hike-and-bike trails.
More than 30. The map on this page shows every one and updates as new sales close.
Talk with a local agent who knows Siena street by street.
Sources: Siena MUD No. 1 official statement (2016), City of Round Rock GIS, Hutto ISD, Williamson County 2025 tax rates, Williamson Central Appraisal District parcel records, Community Impact. Distances are approximate. This page is general information, not legal, tax or lending advice. Last reviewed September 2026.