# Round Rock, Texas electricity: Oncor wires, 4 split ZIP codes to check

_Updated October 19, 2026. Data: ERCOT Oct 5, 2026; Power to Choose Oct 19, 2026, 7:59 AM CT._

**In short:** Every Round Rock-addressed home in ERCOT's competitive data is on Oncor's wires (72,407 active residential meters, October 5, 2026). Most Round Rock addresses can choose a retail provider, but 4 of the ZIP codes below are split, so check your exact address. Your delivery utility handles the wires and outages; the retail provider you choose sets your price and sends the bill.

## Moving to Round Rock

Local numbers for setting up a home in Round Rock, each checked on the official source. More contacts: https://powerhopper.energy/texas-electricity/round-rock/move-in-information

- **Water and utility billing:** utility billing (start, transfer or stop water service), 512-218-5460.
- **Trash pickup:** Republic Services: trash and recycling, 512-255-4980.
- **Natural gas:** Atmos Energy: customer service, 888-286-6700.
- **Public schools:** Round Rock ISD.
- **Driver license:** Texas DPS Driver License Office: Georgetown, 512-424-2600.

## Who delivers electricity in Round Rock?
Every Round Rock-addressed home in ERCOT's competitive data is on Oncor's wires (72,407 active residential meters, October 5, 2026).

## Can every address in Round Rock choose?
Most Round Rock addresses can choose a retail provider, but 4 of the ZIP codes below are split, so check your exact address.

## What is different about Round Rock?
- ZIP 78728 is split: Austin city limits cover about 39% of its land, and Austin Energy customers cannot choose a retail provider; ERCOT still lists 11,156 Oncor homes there, 629 with a Round Rock address. (Source: https://austinenergy.com/, https://www2.census.gov/geo/docs/maps-data/data/rel2020/zcta520/)
- The City of Round Rock’s utility-billing page lists the city for water, wastewater, garbage and recycling, Atmos Energy for gas, and says: “Oncor delivers the electricity. Residents choose the provider of their services for billing.” (Source: https://www.roundrocktexas.gov/departments/utilities-and-environmental-services/utility-billing/)
- To the north, Georgetown Utility Systems is city-owned and has no retail choice; ZIP 78628 shows 13 competitive meters for about 19,084 households. (Source: https://gus.georgetown.org/)

## By the numbers
- Population (July 1, 2025 estimate): 141,282
- Population (2020 estimates base): 119,523
- Occupied households (ACS 2020-2024): 48,647
- Active residential meters with a Round Rock address: 72,407
- Active business meters with a Round Rock address: 7,589
- Residential meters per Census household: 1.49
- Delivery utilities (homes): Oncor 72,407
- Counties: Williamson, Travis
- ZIP codes touching Round Rock: 9
- Split ZIP codes (flagged below): 4

## Plan prices (median ¢/kWh at 500 / 1,000 / 2,000 kWh)
- Oncor: 14.1 / 13.4 / 13.2; delivery 6.8673¢/kWh + $4.06/mo

## ZIP codes
**Not every address in these ZIP codes has retail choice; check your exact address.**

| ZIP | Postal cities | Land in city | Competitive homes | Households | Ratio | Notes |
|---|---|---|---|---|---|---|
| 78665 | Round Rock 29,155, Pflugerville 1 | 61% | 29,157 | 24,162 | 1.21 | Most homes are on the competitive market.  |
| 78664 | Round Rock 23,644, Pflugerville 918 | 72% | 24,563 | 23,484 | 1.05 | Most homes are on the competitive market.  |
| 78634 | Hutto 23,298, Round Rock 254, Taylor 4 | 0% | 23,556 | 15,808 | 1.49 | Most homes are on the competitive market. More meters than year-round households: vacant, seasonal, new or recently built homes. 17 new residential meters Oct 7-18, 2026. Mostly outside Round Rock city limits. |
| 78681 | Round Rock 18,081, Austin 333 | 45% | 18,414 | 20,135 | 0.91 | Most homes are on the competitive market.  |
| 78626 | Georgetown 11,462, Round Rock 123, Weir 12 | 0% | 11,605 | 16,813 | 0.69 | Split. Most, but not all, homes are on the competitive market. Split: City of Georgetown (Georgetown city limits cover about 23% of the ZIP's land); that utility's customers can't choose. 16 new residential meters Oct 7-18, 2026. Mostly outside Round Rock city limits. |
| 78728 | Austin 10,480, Round Rock 629, Pflugerville 47 | 5% | 11,156 | 13,169 | 0.85 | Split. Most homes are on the competitive market. Split: Austin Energy (Austin city limits cover about 39% of the ZIP's land); that utility's customers can't choose. Mostly outside Round Rock city limits. |
| 78717 | Austin 1,802, Round Rock 371 | 0% | 2,173 | 14,939 | 0.15 | Split. Few homes are on the competitive market. Split: Austin Energy (Austin city limits cover about 72% of the ZIP's land); that utility's customers can't choose. Mostly outside Round Rock city limits. |
| 78653 | Manor 1,433, Round Rock 85, Pflugerville 26 | 0% | 1,570 | 14,612 | 0.11 | Split. Few homes are on the competitive market. Split: Austin Energy (Austin city limits cover about 7% of the ZIP's land); that utility's customers can't choose. Mostly outside Round Rock city limits. |
| 78680 | Round Rock 59 | 0% | 59 | n/a | n/a | PO box or special ZIP; no household count to compare. Mostly outside Round Rock city limits. |

## Business electricity in Round Rock
7,589 active business meters. Power Hopper compares offers from retail electric providers and direct suppliers; for high-consumption businesses we can run a competitive bid. No savings or bidder count is promised. Businesses in Texas retail-choice areas can request a rate review online.

## Questions
**Does the City of Round Rock provide electricity?** No. The city provides water, wastewater, drainage and garbage service. Its utility-billing page says Oncor delivers the electricity and residents choose the provider that bills them; Atmos Energy provides gas.
**Is Round Rock Oncor or Austin Energy?** Round Rock-addressed homes in ERCOT's data are all Oncor (72,407 on October 5, 2026). Austin Energy serves inside Austin city limits, which cover about 39% of ZIP 78728 next door.
**Can I choose my electricity provider in Round Rock?** Yes on Oncor's wires. Some homes on the edges are served by Pedernales or Bluebonnet electric co-ops, which don't offer choice. Check your exact address.
**Which Round Rock ZIP has the most homes on the market?** 78665 (29,157 competitive meters), then 78664 (24,563) and 78681 (18,414), per ERCOT's October 5, 2026 data.
**Is ZIP 78681 Round Rock or Austin?** Mostly Round Rock by mailing address: 18,081 of its 18,414 competitive homes use Round Rock and 333 use Austin, all on Oncor’s wires, and about 45% of the ZIP’s land is inside Round Rock city limits. Austin Energy territory begins farther south, in ZIPs such as 78728.

## Sources
- ERCOT TDSP ESIID Extract (report 203): full extract as of Oct 5, 2026; daily files Oct 7-18, 2026: https://www.ercot.com/misapp/GetReports.do?reportTypeId=203
- Census ACS 2020-2024 5-year estimates (B25003 households, B01003 population): https://www2.census.gov/programs-surveys/acs/summary_file/2024/table-based-SF/data/5YRData/
- Census Vintage 2025 city and town population estimates: https://www2.census.gov/programs-surveys/popest/datasets/2020-2025/cities/totals/sub-est2025_48.csv
- Census 2020 ZCTA-to-place and ZCTA-to-county relationship files: https://www2.census.gov/geo/docs/maps-data/data/rel2020/zcta520/
- EIA-861 (2024) utility service territories by county: https://www.eia.gov/electricity/data/eia861/
- PUCT Power to Choose residential offer export, Oct 19, 2026, 7:59 AM CT: https://www.powertochoose.org/en-us/Plan/ExportToCsv
- PUCT: Choosing an Electric Plan: https://www.puc.texas.gov/consumer-help/electricity/electric-plan/
- PUCT broker directory (BR260201): https://www.puc.texas.gov/industry/electric/directories/brk/alpha_brk/
- Oncor Electric Delivery: https://www.oncor.com/
- Oncor delivery tariff (effective October 4, 2026): https://interchange.puc.texas.gov/Documents/59249_105_1676040.PDF
- Austin Energy (City of Austin utility): https://austinenergy.com/
- Census 2020 ZCTA-to-place relationship file: https://www2.census.gov/geo/docs/maps-data/data/rel2020/zcta520/
- City of Round Rock: Utility Billing: https://www.roundrocktexas.gov/departments/utilities-and-environmental-services/utility-billing/
- Georgetown Utility Systems (city-owned): https://gus.georgetown.org/
- City of Round Rock: Utility Billing: https://www.roundrocktexas.gov/departments/utilities-and-environmental-services/utility-billing/

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