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Interstate 19
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<!--Due to the unique situation where all road signs use metric system, this article uses metric system despite located in the United states and breaking WP:MoS convention. Do not change the unit of measurement without discussing in talk page --> {{Short description|Interstate Highway in southern Arizona}} {{Use mdy dates|date=October 2011}} {{Use American English|date=March 2023}} {{Infobox road | state = AZ | type = I | route = 19 | map = {{maplink|frame=yes|plain=yes|frame-align=center|frame-width=290|frame-height=250|type=line|from=Interstate 19.map|stroke-width=3}} | map_custom = yes | map_notes = I-19 highlighted in red | length_km = 102.08 | length_ref = <ref name="ADOT Highway Log"/> | established = 1963<ref name="ADOT Highway Log 1998" /> | direction_a = South | terminus_a = {{jct|state=AZ|BL|19|dab1=Nogales}} in [[Nogales, Arizona|Nogales]] | junction = <!-- Major junctions only; Only 10 most major intersections and cities belong here; please read [[WP:USRD/STDS]] for more info -->{{plainlist|1= * {{jct|state=AZ|AZ|189}} in Nogales * {{jct|state=AZ|BL|19|dab1=Nogales}} north of Nogales * {{jct|state=AZ|AZ|289}} in [[Rio Rico, Arizona|Rio Rico]] * {{jct|state=AZ|AZ|86}} in [[Tucson, Arizona|Tucson]] }} | direction_b = North | terminus_b = {{jct|state=AZ|I|10}} in Tucson | counties = [[Santa Cruz County, Arizona|Santa Cruz]], [[Pima County, Arizona|Pima]] | previous_type = I | previous_route = 17 | next_type = AZ | next_route = 24 }} '''Interstate 19''' ('''I-19''') is a north–south [[Interstate Highway]] located entirely within the US state of [[Arizona]]. I-19 travels from [[Nogales, Arizona|Nogales]], roughly {{convert|90|m|ft|sp=us}} from the [[Mexico–United States border|Mexican border]], to [[Tucson, Arizona|Tucson]], at [[Interstate 10 in Arizona|I-10]]. The highway also travels through the cities of [[Rio Rico, Arizona|Rio Rico]], [[Green Valley, Arizona|Green Valley]], and [[Sahuarita, Arizona|Sahuarita]]. Having a total length of just over {{convert|102|km|mi|sp=us}}, I-19 is the eighth-shortest primary (two-digit) Interstate Highway in the contiguous 48 states, where only [[Interstate 86 (Idaho)|I-86]] (Idaho), [[Interstate 11|I-11]] (Nevada), [[Interstate 2|I-2]] (Texas), [[Interstate 42 (North Carolina)|I-42]] (North Carolina), [[Interstate 14|I-14]] (Texas), [[Interstate 97|I-97]] (Maryland), and [[Interstate 87 (North Carolina)|I-87]] (North Carolina) are shorter. While the highway is short, it is a very important corridor, serving as a fast route from Tucson and [[Phoenix, Arizona|Phoenix]] (via I-10) to the Mexican border. The highway is a portion of the US section of the [[CANAMEX Corridor]], a trade corridor that stretches north from [[Mexico]] across the US to the [[Canada|Canadian]] province of [[British Columbia]].
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