Roundabouts by State: Which States Have the Most Roundabouts?
Bill Tran
Roundabouts are no longer rare in the United States. A July 2026 extraction of Kittelson’s live U.S. roundabout data lists 15,269 roundabouts and traffic circles across the country.
The updated data also shows how uneven roundabout adoption is by state. Florida has 1,628 listed roundabouts and traffic circles, more than any other state. California, Texas, Indiana, and Washington round out the top five. Together, the top 10 states account for 53.8% of all listed U.S. records.
Quick answer: The U.S. has 15,269 roundabouts and traffic circles listed in the live Kittelson Roundabouts Database report. Florida ranks first with 1,628, followed by California with 913, Texas with 872, Indiana with 803, and Washington with 752.
Source note: Kittelson labels this report as “Roundabouts/Traffic Circles.” This article keeps that wording in the data tables, while using “roundabouts” as a reader-friendly shorthand in the general discussion.
How Many Roundabouts Are in the U.S.?
The latest extraction found 15,269 roundabouts and traffic circles across the 50 states, Washington, DC, and U.S. territories. The 50 states account for 15,218 records. The 50 states plus Washington, DC account for 15,241 records. U.S. territories account for 28 records.
This matters because many older roundabout articles still cite lower national estimates. The newer data shows that circular intersections have become a normal part of U.S. road design, especially in states that use them for intersection safety, traffic flow, new development, and local road upgrades.
The count should not be read as a perfect federal census. It is best understood as a live database count from one of the most widely used public roundabout inventories.
Roundabouts by State
Florida has the most listed roundabouts and traffic circles, with 1,628 records. California ranks second with 913, followed by Texas with 872, Indiana with 803, and Washington with 752.
The chart gives a quick visual ranking, while the full table below lists every state, Washington, DC, and U.S. territory included in the extraction.
| Rank | State or Territory | Roundabouts / Traffic Circles | Share of U.S. Total |
|---|---|---|---|
| 1 | Florida | 1,628 | 10.7% |
| 2 | California | 913 | 6.0% |
| 3 | Texas | 872 | 5.7% |
| 4 | Indiana | 803 | 5.3% |
| 5 | Washington | 752 | 4.9% |
| 6 | North Carolina | 722 | 4.7% |
| 7 | Colorado | 694 | 4.5% |
| 8 | Wisconsin | 631 | 4.1% |
| 9 | Georgia | 612 | 4.0% |
| 10 | Minnesota | 589 | 3.9% |
| 11 | Maryland | 566 | 3.7% |
| 12 | Ohio | 544 | 3.6% |
| 13 | Missouri | 380 | 2.5% |
| 14 | Virginia | 378 | 2.5% |
| 15 | Michigan | 326 | 2.1% |
| 16 | Arizona | 307 | 2.0% |
| 17 | Utah | 303 | 2.0% |
| 18 | South Carolina | 299 | 2.0% |
| 19 | Nebraska | 287 | 1.9% |
| 20 | Oregon | 281 | 1.8% |
| 21 | New York | 274 | 1.8% |
| 22 | Kansas | 247 | 1.6% |
| 23 | Pennsylvania | 233 | 1.5% |
| 24 | Massachusetts | 230 | 1.5% |
| 25 | Iowa | 185 | 1.2% |
| 26 | New Jersey | 163 | 1.1% |
| 27 | Nevada | 162 | 1.1% |
| 28 | Illinois | 153 | 1.0% |
| 29 | Tennessee | 151 | 1.0% |
| 30 | Louisiana | 145 | 0.9% |
| 31 | Idaho | 133 | 0.9% |
| 32 | Arkansas | 128 | 0.8% |
| 33 | Delaware | 126 | 0.8% |
| 34 | Kentucky | 121 | 0.8% |
| 35 | Alabama | 117 | 0.8% |
| 36 | Montana | 97 | 0.6% |
| 37 | New Mexico | 89 | 0.6% |
| 38 | New Hampshire | 71 | 0.5% |
| 39 | Mississippi | 66 | 0.4% |
| 40 | North Dakota | 66 | 0.4% |
| 41 | Connecticut | 65 | 0.4% |
| 42 | Alaska | 54 | 0.4% |
| 43 | Hawaii | 47 | 0.3% |
| 44 | Maine | 40 | 0.3% |
| 45 | Rhode Island | 39 | 0.3% |
| 46 | Oklahoma | 35 | 0.2% |
| 47 | West Virginia | 33 | 0.2% |
| 48 | District of Columbia | 23 | 0.2% |
| 49 | Puerto Rico | 22 | 0.1% |
| 50 | Wyoming | 22 | 0.1% |
| 51 | Vermont | 21 | 0.1% |
| 52 | South Dakota | 18 | 0.1% |
| 53 | American Samoa | 4 | <0.1% |
| 54 | Guam | 1 | <0.1% |
| 55 | U.S. Virgin Islands | 1 | <0.1% |
What the State Ranking Shows
The biggest finding is concentration. The top five states account for 4,968 records, or 32.5% of the national total. The top 10 account for 8,216 records, or 53.8%. The top 20 account for 11,887 records, or 77.9%.
Florida is the clear outlier. Its 1,628 listed roundabouts and traffic circles are nearly twice California’s count and almost twice Texas’s count. Florida alone accounts for 10.7% of all U.S. records in the extracted data.
The ranking is not only about population. California, Texas, and Florida are large states, so high counts are expected. But Indiana, Washington, Wisconsin, Colorado, Minnesota, and Maryland also rank near the top, even though they are not among the largest states by population. That suggests some states have adopted roundabouts much more aggressively than others.
At the low end, South Dakota has the fewest listed records among the 50 states, with 18. Vermont has 21, Wyoming has 22, West Virginia has 33, and Oklahoma has 35.
Roundabouts by Year Built
The year-built data tells a second story: most listed roundabouts with known construction years are relatively recent. The dataset includes 12,411 records with a listed construction year. Another 2,858 records are not represented in the year-built table, so the trend below should be read as a known-year trend, not a complete construction history.
| Period | Known-Year Records | What It Shows |
|---|---|---|
| Before 1990 | 110 | Older circular intersections existed, but they were a small part of the known-year dataset. |
| 1990 to 1999 | 333 | The modern U.S. roundabout era was still early. |
| 2000 to 2009 | 3,662 | Roundabout construction expanded quickly during the 2000s. |
| 2010 to 2019 | 5,208 | The 2010s were the strongest decade in the known-year data. |
| 2020 to 2026 | 3,098 | Recent records remain high, but 2025 and 2026 should be treated as still-updating years. |
The highest single years in the known-year data are clustered in the mid-2010s through early 2020s. The top years are 2018 with 654 records, 2019 with 623, 2017 with 613, 2020 with 608, and 2016 with 588.
| Rank | Year Built | Known-Year Records |
|---|---|---|
| 1 | 2018 | 654 |
| 2 | 2019 | 623 |
| 3 | 2017 | 613 |
| 4 | 2020 | 608 |
| 5 | 2016 | 588 |
| 6 | 2015 | 563 |
| 7 | 2021 | 562 |
| 8 | 2022 | 553 |
| 9 | 2007 | 549 |
| 10 | 2023 | 545 |
Why Are More Roundabouts Being Built?
Roundabouts are growing because they can solve several road problems at the same time. A properly designed modern roundabout slows vehicles before they enter the intersection, reduces severe crossing conflicts, and can keep traffic moving without a full signal cycle.
The Federal Highway Administration lists roundabouts as a Proven Safety Countermeasure. FHWA reports an 82% reduction in fatal and injury crashes when converting two-way stop-controlled intersections to roundabouts, and a 78% reduction when converting signalized intersections to roundabouts.
The safety benefit comes from the layout. At a traditional intersection, vehicles can cross paths at higher speeds from several directions. At a roundabout, vehicles enter at lower speeds and move in the same direction around the central island. That reduces the chance of the most severe right-angle, left-turn, and head-on crash types.
Roundabout vs Traffic Circle
People often use “roundabout” and “traffic circle” as if they mean the same thing, but they are not always the same design.
A modern roundabout is usually smaller, slower, and designed with yield control at each entry. Drivers entering the roundabout yield to vehicles already circulating. The curved approach is intentional because it slows traffic before vehicles enter the circular roadway.
An older traffic circle or rotary is often larger and may allow higher speeds. Some older circular intersections also use stop signs or traffic signals. This is why the source label matters. The dataset used for this article is broader than a strict count of only modern roundabouts.
Common Signs Used at Roundabouts
Roundabouts need clear signing, especially when drivers are approaching a new layout for the first time. The exact signs depend on speed, lane count, pedestrian crossings, approach geometry, and local agency standards.
| Sign Type | Purpose | Common Use Near Roundabouts |
|---|---|---|
| Circular intersection warning sign | Warns drivers that a circular intersection or roundabout is ahead. | Placed on the approach, especially where drivers may not expect a roundabout. |
| Yield sign | Tells entering drivers to yield to circulating traffic. | Placed at each roundabout entry. |
| One Way sign | Shows the required direction of travel around the central island. | Used inside or near the circular roadway, depending on the layout. |
| Lane control signs | Help drivers choose the correct lane before entering. | Common on multi-lane roundabout approaches. |
| Pedestrian crossing signs | Alert drivers to crosswalks near splitter islands and approaches. | Used where pedestrian crossings are present near the roundabout. |
| Chevron and alignment signs | Improve guidance around curves, islands, and roadway edges. | Used where extra visual guidance is needed. |
RoadSigns.com carries MUTCD-style road warning signs, regulatory signs, and pedestrian signs that are commonly used around roundabouts and other intersection projects. Always review the current MUTCD, state standards, project plans, and local agency requirements before ordering signs for a public roadway.
Methodology
This article uses a July 2026 extraction from the Kittelson Roundabouts Database. The state table comes from the live “Roundabouts/Traffic Circles by State/Province” report. The year-built section comes from the live “Roundabouts/Traffic Circles by Year Constructed” report.
Kittelson describes the database as an online inventory of roundabouts and other circular intersections. The database is intended to be comprehensive, but Kittelson notes that it is based on volunteer contributions and does not guarantee completeness or accuracy.
Because of that, the numbers in this article should be read as the best available live database counts, not as a federal census of every modern roundabout in the country. The dataset also includes traffic circles, so the count is broader than a strict modern-roundabout-only count.