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| 280-299 | 300 | 301 | 302 | 303 | 304 | 305 | 306 | 307 | 308 | 309 | 320-339 |
| 310 | 311 | 312 | 313 | 314 | 315 | 316 | 317 | 318 | 319 | ||
| Iowa 300 |
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Designated: June 4, 1935 Decommissioned: July 1, 2003 Original northern terminus: Modale Original southern terminus: US 30 near California Junction Counties: Harrison Paving history: Unpaved at designation, the original segment remained gravel when IA 300 was rerouted. The post-1967 alignment was entirely paved. Major alignment change: In 1967, IA 300 became an east-west spur between Modale and I-29 (exit #82) upon this segment of I-29's completion. Replaced by: |
| Iowa 301 |
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Designated: June 4, 1935 Decommissioned: July 1, 2003 Original western terminus: US 75; it was moved westward to I-29 (exit #95) upon its completion in 1967 Original eastern terminus: Little Sioux Counties: Harrison Paving history: Unpaved at designation, it was upgraded from bituminous to paved in 1975. Replaced by: County Road F20 and local streets (2nd Street and Mulberry Street) in Little Sioux Terminus photos |
| Iowa 302 |
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Designated: June 4, 1935 Decommissioned: July 1, 1980 (the city of Thor took over its piece on September 15) Original northern terminus: IA 10 (later IA 3) Original southern terminus: Thor Counties: Humboldt Paving history: Unpaved at designation, it was paved in 1938. Replaced by: County Road P66 |
| Iowa 303 (I) |
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Designated: June 4, 1935 Decommissioned: April 6, 1981 Original northern terminus: US 34 west of Fairfield Original southern terminus: Libertyville Counties: Jefferson Paving history: Unpaved at designation, it was upgraded from bituminous to paved in 1973. Replaced by: County Road V64 Former terminus photos |
| Iowa 303 (II) |
| Listed on the Wisconsin DOT's 2008 Numbering State Trunk Highways survey, this was the designation for the former segment of US 151 through Monticello that was bypassed by an expressway segment in 2004. It was turned over to Jones County by the end of the year. It is still signed as Business US 151. (There is no legal description available.) |
| Iowa 304 |
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Designated: June 4, 1935 Decommissioned: July 1, 1980 Original western terminus: IA 149 east of Martinsburg; it was truncated to a point two miles south of Ollie in 1948 Original eastern terminus: Ollie Counties: Keokuk Paving history: Unpaved at designation, it was paved in 1960. Replaced by: IA 78 (in 1948); County Road V5G and Main Street in Ollie (at decommissioning) |
| Iowa 305 |
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Designated: June 4, 1935 Decommissioned: July 1, 2003 Original western terminus: Letts Original eastern terminus: US 61, later US 61/IA 92 Counties: Louisa Paving history: Unpaved at designation, it was paved in 1955. Replaced by: County Roads X43 (north-south segment) and G40 (east-west segment), although street signs in Louisa County refer to it as County Road 305. Terminus photos |
| Iowa 306 |
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Designated: June 4, 1935 Decommissioned: July 1, 2003 Original western terminus: US 65 Original eastern terminus: Derby Counties: Lucas Paving history: Unpaved at designation, it was paved in 1955. Replaced by: County Road H50 Terminus photos |
| Iowa 307 |
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Designated: June 4, 1935 Decommissioned: 1976 (approved April 22, 1975) Original western terminus: US 169 in southern Madison County Original eastern terminus: East Peru Counties: Madison Paving history: Unpaved at designation, it was paved in 1963. Replaced by: County Road G68 Note: The decommissioning of IA 307 coincided with the opening of the relocated US 169 south of Winterset. |
| Iowa 309 |
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Designated: June 4, 1935 Decommissioned: July 14, 1980 (see below) Original western terminus: Beacon Original eastern terminus: IA 92 in Oskaloosa; it was truncated at IA 137 (now part of US 63) before its decommissioning. Counties: Mahaska Paving history: Unpaved at designation, it was paved in 1939. Replaced by: County Road T39 Note: The decommissioning date listed was when Mahaska County took over its piece of the road. Oskaloosa took over its piece on September 22, 1980, and Beacon did the same on October 28, 1980. |
| Iowa 310 |
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Designated: June 4, 1935 Decommissioned: December 31, 1966 Original northern terminus: Harvey Original southern terminus: IA 92 Counties: Marion Paving history: Unpaved at designation, it was paved in 1960. Replaced by: Unnumbered county road (it followed Main Street in Harvey and 216th Place) |
| Iowa 311 |
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Designated: June 4, 1935 Decommissioned: December 26, 1989 Original western terminus: Liscomb; it was truncated at the east city limits on November 18, 1980. Original eastern terminus: IA 14 Counties: Marshall Paving history: Unpaved at designation, it was paved in 1961. Replaced by: County Road E18 Former terminus photos |
| Iowa 312 (I) |
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Designated: June 4, 1935 Decommissioned: July 1, 1980 Original northern terminus: McIntire Original southern terminus: IA 9 Counties: Mitchell Paving history: Unpaved at designation, it was paved in 1955. Replaced by: County Road T62 and Main Street in McIntire |
| Iowa 312 (II) |
| This number was assigned to two former US 65 segments near Engledinger Marsh in northeastern Polk County that were bypassed after a new four-lane segment opened in November 2002. One segment dead-ended from US 65, and the other dead-ended from NE 118th Avenue in both directions; the segment in between was removed after the relocated US 65 opened. Both segments were transferred to local jurisdictions on January 24, 2003. |
| Iowa 313 |
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Designated: June 4, 1935 Decommissioned: July 10, 2002 Original western terminus: US 59 Original eastern terminus: Melvin; it was truncated at the west city limits on August 11, 1980. Counties: Osceola Paving history: Unpaved at designation, it was paved in 1937. Replaced by: County Road A48 Former terminus photos |
| Iowa 314 |
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Designated: June 4, 1935 Decommissioned: April 16, 2003 Original northern terminus: US 18 east of Ruthven Original southern terminus: Ayrshire Counties: Palo Alto Paving history: Unpaved at designation, it was paved in 1940. Replaced by: County Road N28 outside of Ayrshire; it made a turn eastward before ending and continued as County Road B53. Terminus photos |
| Iowa 315 |
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Designated: June 4, 1935 Decommissioned: April 21, 2003 Original western terminus: IA 4 in southern Pocahontas County Original eastern terminus: Palmer Counties: Pocahontas Paving history: Unpaved at designation, it was paved in 1956. Replaced by: County Road C56, plus local roads (Hansen Avenue and Main Street) in Palmer. Terminus photos |
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Iowa 316 |
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Length: 5.8 miles/9.3 kilometers Northern terminus: East city limits of Runnells Southern terminus: IA 5 on the Warren/Marion county line Terminus photos Counties: Polk, Warren, Marion |
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| History | |
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Designated: June 4, 1935, as a spur from the then-US 163 southward into Runnells Paving history: Unpaved at designation, the original segment was paved in 1957. The 1980 extension was entirely paved. Major alignment changes: |
| Iowa 317 |
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Designated: June 4, 1935 Decommissioned: August 25, 1980 Original western terminus: McCallsburg; it was truncated at US 65 on February 9, 1954 Original eastern terminus: US 65; it was extended eastward to Zearing in 1950, replacing IA 387 (I) and sharing part of US 65 along the way. (The duplication with US 65 was removed when the segment from US 65 to McCallsburg was decommissioned.) Counties: Story Paving history: Unpaved at designation, the remaining segment from US 65 to Zearing was paved in 1955. Replaced by: County road, now numbered E18 (in 1954); local road (Main Street in Zearing, at decommissioning). The segment in Zearing became unsigned IA 947 until the city assumed jurisdiction on July 25, 1986. |
| Iowa 318 |
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Designated: June 4, 1935 Decommissioned: July 22, 1980 (the city of Clutier took over its piece on August 18) Original western terminus: Clutier Original eastern terminus: IA 21 on the Tama/Benton county line Counties: Tama Paving history: Unpaved at designation, it was paved in 1962. Replaced by: County Road E36 and Main Street in Clutier |
| Iowa 319 |
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Designated: June 4, 1935 Decommissioned: July 1, 1980 Original western terminus: Gravity Original eastern terminus: Conway; it was truncated at IA 148 on December 13, 1961. Counties: Taylor Paving history: Unpaved at designation, the segment from the western split with IA 49 to Conway was paved in 1955. The remaining segment between Gravity and IA 148 was paved in 1962 (at the same time as IA 148). Replaced by: |