Is Washington a separate city from St. George?

Yes, and the distinction matters more than the continuous development suggests. Washington has its own government, zoning and ordinances, which means short-term rental permission, building rules and municipal services are set separately from St. George. Confusingly, Washington Fields — despite the name — is largely within St. George city rather than Washington. Washington County publishes parcel and jurisdiction layers in its public GIS, which is the quickest way to settle which city governs a specific address.

How do Coral Canyon and Green Spring differ?

Mostly by age and scale. Green Spring is one of the oldest and most established golf neighborhoods in the region, a mature collection of subdivisions around a municipal course known for dramatic red-rock canyon holes, with big-box shopping directly at its doorstep. Coral Canyon is much larger and newer — roughly 1,338 homes across about 2,600 acres around Keith Foster's public championship course, with resort-style pools and miles of trails. Green Spring offers maturity and convenience; Coral Canyon offers scale and amenities.

What is Sienna Hills?

Washington City's largest and newest master-planned community — roughly 740 acres off Washington Parkway, developed as multiple villages spanning entry-level villas through to substantial resort homes. Its distinguishing feature is that it deliberately mixes primary-residence neighborhoods with short-term-rental resort villages, so what you may do with a property depends heavily on which village it sits in. Verify the rules for the specific address rather than for the community as a whole.

Washington City: Coral Canyon, Green Spring, and Sienna Hills

Washington City explained: a separate city east of St. George, and how Coral Canyon, Green Spring and Sienna Hills differ.

Washington sits immediately east of St. George and the development between them is continuous, which leads people to treat it as part of the same place. It is not, and the distinction has practical consequences.

It is a separate city, and that matters

Washington was settled in 1857 as part of the Mormon Cotton Mission — older than a great deal of what surrounds it — and it is now a fast-growing city with its own government, zoning and ordinances.

What follows from that:

Short-term rental permission is set by Washington, not St. George, and the rules differ.
Building rules, permits and inspections run through Washington's planning department.
Municipal services are Washington's.

One genuine trap: Washington Fields, despite the name, is largely within St. George city. If you are researching rules for a property there, you are probably looking at the wrong city. Washington County's public GIS publishes parcel and jurisdiction layers, which settles it definitively.

Green Spring — the established golf neighborhood

One of the oldest and most established golf neighborhoods in greater St. George: a mature collection of subdivisions anchored by the municipal Green Spring Golf Course, known for its dramatic red-rock canyon holes.

Its distinguishing practical feature is convenience — big-box shopping is directly at its doorstep, which is unusual for a golf neighborhood and genuinely useful day to day.

Suits: buyers who want maturity, established landscaping and services within a very short distance, and who are content with an older housing stock.

Coral Canyon — scale and amenities

Much larger and newer: roughly 1,338 homes across about 2,600 acres, built around Keith Foster's public championship course, with resort-style pools, miles of trails, and views to the red rock and the Pine Valley Mountains.

The scale is what supports the amenities, and the public course means golf without a membership requirement.

Suits: buyers who want a full master-planned community with recreation built in, and who do not mind being further from the older commercial core.

Sienna Hills — the newest, and the most mixed

Washington City's largest and newest master-planned community — roughly 740 acres off Washington Parkway, developed as multiple villages spanning entry-level villas to substantial resort homes.

Its distinguishing feature is deliberate mixing: some villages are primary-residence neighborhoods and others are short-term-rental resort villages. What you may do with a property therefore depends on which village it is in, not on the community as a whole.

Suits: buyers wanting new construction with a wide range of price points — and investors, provided they verify the specific village's rules.

Choosing between them

Maturity and convenience: Green Spring.

Amenities and scale: Coral Canyon.

New construction and range: Sienna Hills.

If short-term rental is the plan: Sienna Hills has villages designed for it, but confirm for the exact address with Washington City and with the HOA, since either can prohibit it.

What applies across all three

Read the HOA documents for the specific village or subdivision, not the community brochure.
Verify jurisdiction and rental rules by address.
Inspect properly — cooling, roof and stucco under severe UV, plus a radon test regardless of age.
Claim the primary-residence exemption if you will live there: 55% of value versus 100% for anything else, roughly 1.8 times the tax on an identical house.