St. Joseph

Interstate 229 loops west from I-29 to Downtown St. Joseph along the Missouri River while I-29 bypasses the city to the east. In addition to the urban freeway loop, a 14.066 mile Business Loop travels surface roads through St. Joe.

Business Loop I-29 veers northwest from Exit 44 with U.S. 169 along a four-lane arterial (Belt Highway) to Pear Street. U.S. 169 stays north parallel to I-29 while the business route follows Pear Street west and Garfield Avenue north adjacent to a BNSF Railroad. The locally maintained section separates into a couplet along 9th and 10th Streets (old U.S. 59) across Downtown.

The one-way pair combines along Frederick Avenue at Francis Street (old U.S. 36 / Missouri 6) by St. Joseph City Hall. The three-lane boulevard angles northeast to Highly Street, and east back to U.S. 169 (Belt Parkway) at East Hills Mall.

Belt Parkway constitutes a commercial arterial northward to the Andrew County line, and a rural divided highway from the village of Country Club to I-29 at Exit 53. Business Loop I-29 overlaps with U.S. 169 from Frederick Boulevard to Rochester Road and U.S. 59 from Country Club Road to Interstate 29.

North Sioux City

Business Spur I-29P is an unsigned route linking I-29 at Exit 4 with parallel old U.S. 77 (Highway 105) along Northshore Drive. The 0.226 mile segment may have been part of a longer loop following South Dakota 105 south to Main Street, Military Road and River Drive west to I-29 at Exit 2. River Drive was previously an unsigned business spur.¹

Elk Point

Dating back to at least the mid-1960s, Business loop I-29 was designated over local roads, as U.S. 77 followed Rose Street to the northeast of the Elk Point business district.

Sioux Falls

Business Spur I-29 & South Dakota 42 provide a direct route to Downtown Sioux Falls along 12th Street (old U.S. 16) east to Menlo Avenue and the one-way pair of 10th and 11th Streets. The 2.5 mile route concludes at Minnesota Avenue, where Business Spur I-90, Business Loop I-229 and SD 115 come together.

Downtown Sioux Falls is the only city with two Interstate business spurs and a business loop intersecting at the same place. Minnesota Avenue north leads to Sioux Falls Regional Airport (FSD) and I-90 as Business Spur I-90 & SD 115. Business Spur I-229 turns from Minnesota Avenue (SD 115) and the All Saints neighborhood to the south of Downtown onto 10th / 11th Streets to the Whittier community east of the Big Sioux River.

All business routes within the city of Sioux Falls were transferred from SDDOT jurisdiction to city maintenance in 2006.² As South Dakota allows for locally maintained routes to be signed as state highways, the three business routes remain posted.

Many signs for Business Spur I-29 and the other two Interstate business routes in Sioux Falls display "Downtown" in place of Business. Also of note is that sometime after 1991, a loop ramp connected Grange Avenue north with 12th Street west by the one-way street separation of SD 42. A city park and the Obtuse, by sculptor Harry Klessen, are located at the site of the former roadway today

Brookings

Previously referenced as a business loop between Exits 127 and 132, signs along Interstate 29 were eventually changed to reference a Business Spur for I-29 at U.S. 14 (6th Street). The route is unsigned along 6th Street at Medary Avenue (old U.S. 77) in Downtown Brookings. An August 2016 visit to the city revealed a Business Loop I-29 shield posted at the northbound off-ramp (Exit 132) as the lone marker for the route.

The business loop was commissioned sometime after the early 1990s³ and thought to run west from Exit 127 along 217th Street to County Road 77 (old U.S. 77) north. CR 77 becomes Main Avenue north en route to the city center, where the loop may have turned east along side U.S. 14 (6th Street) to I-29.

Chris Geelhart noted a different set of end points, with the business route looping west between Exits 132 and 133,³ perhaps along Medary Avenue from U.S. 14 (6th Street) to U.S. 14 Bypass (18th Street).

Sioux Falls

I-229 through Sioux Falls comprises an urban loop and commuter route connecting Interstates 29 and 90. The freeway bypasses the city center to the east while I-29 stays well to the west. Business Loop I-229 connects Downtown Sioux Falls with I-229 to the south via Minnesota Avenue (old U.S. 77) north from Exit 3 and 10th and 11th Streets (old U.S. 16) west from Exit 6. The 4.4 mile route overlaps with SD 115 on the north-south leg and SD 42 along the east-west leg and couplet of 10th/11th Streets.

Many of the signs for Business Loop I-229 were removed during a construction project in 2003.³ These were restored by 2007, following a maintenance transfer of the route from SDDOT to the city of Sioux Falls. Like the other business routes in Sioux Falls, signs for BL I-229 often display "Downtown" in place of Business.