Curtis is an unincorporated community in Mackinac County in the U.S. state of Michigan. The community is located within Portage Township. As an unincorporated community, Curtis has no legally defined boundaries or population statistics of its own but does have its own, post office with the 49820 ZIP Code. Geography The community of Curtis is located within central Portage Township in the state's Upper Peninsula about west of the Mackinac Bridge. Curtis sits at an elevation of above sea level. The community is a popular tourist destination and is surrounded by numerous lakes, including the three Manistique Lakes (Manistique Lake, North Manistique Lake, and South Manistique Lake), as well as Milakokia Lake, Millecoquins Lake, and the smaller Lake Ann Louise. Other nearby bodies of water include Shoepac Lake and Black Creek Flooding. Black Creek is a tributary of Portage Creek, which connects Manistique Lake to the north with South Manistique Lake. Portage Creek flows through the center of the community, which is situated along a narrow stretch of land between the two larger lakes. Curtis is centered along H-42 (Main Street), which runs west to connect to M-77. H-42 has its eastern terminus at H-33 (Manistique Lakes Road) just east of the center of the community, and H-33 runs north to M-28 and south to U.S. Highway 2 (US 2). Other nearby communities include Helmer and McMillan to the north, Germfask to the northwest, Blaney Park to the southwest, Gould City to the south, and Engadine to the southeast. The community has its own post office that uses the 48920 ZIP Code. The post office serves a small area that includes the central portion of Portage Township, as well as a smaller portion of Lakefield Township in Luce County to the north. Areas just to the west of the community may use the Germfask 49836 ZIP Code. The community is within the southern boundaries of Tahquamenon Area Schools in Newberry, which has the largest area of any public school district in the state. The Portage Township Offices are located in Curtis at W17361 Davis Street. Because of the community's close proximity to several lakes, the Michigan Department of Natural Resources maintains numerous public boat launches in the Curtis area. The two closest to the center of the community are located along the southern shores of Manistique Lake with one along Long Road and another to the northeast in Portage Township