http://en.wikipedia.org/wiki/Dearborn,_Michigan#Arab_AmericansDearborn, MI
The city's [Dearborn, MI] population includes 40,000 Arab Americans. Ethnic Arabs own many shops and businesses, offering services in both English and Arabic. In the 2010 census, Arab Americans comprised 40% of Dearborn's population; many have been in the city for several generations. The city has the largest proportion of Arab Americans in the United States. As of 2006 Dearborn also has the largest Lebanese American population in the United States.
The first Arab immigrants came in the early-to-mid-20th century to work in the automotive industry and were chiefly Lebanese Christians (Maronites). Other immigrants from the Mideast in the early twentieth century included a large Armenian-American community, who are Christian. Assyrians/Chaldeans/Syriacs have also immigrated to the area. Since then, Arab immigrants from Yemen, Iraq and the Palestinian territories, most of whom are Muslim, have joined them. Lebanese Americans are still the most numerous group. The Arab Muslim community has built the Islamic Center of America, the largest mosque in North America, and the Dearborn Mosque. More Iraqi refugees have come, fleeing the continued war in their country since 2003.
Warren Avenue has the commercial center of the Arab-American community. The Arab American National Museum is located in Dearborn. The museum was opened in January 2005 to mark the Arab American community's history and contributions to the United States.
http://en.wikipedia.org/wiki/Dearborn,_Michigan#Free_speech_controversyFour members of the Christian group "Acts 17 Apologetics" were arrested and prosecuted for breach of the peace in 2010
because they were walking around the annual Arab-American Festival talking to people at the festival about Christianity. All the charges, except one of failure to obey a police order, were thrown out by a jury. During the festival, four other people from Apologetics
were blocked from handing out Arabic-English copies of the Gospel of John on a public street. Police ordered them to stop filming the incident, to provide identification, and to move at least five blocks from the border of the fair.
From what I found on citydata.com, Islam comprises between 6% & 7% of the religious population of the county Dearborn is in.