The World Communion of Reformed Churches is the largest association of Reformed churches worldwide, representing more than 80 million Christians in 229 denominations throughout 108 countries.
The most well known include the Presbyterian Church (USA), the Church of Scotland, and the Dutch Reformed Church.
Yes, Calvinism is still believed in a number of different churches. The "Reformed Theology" follows all the teachings of Calvin as outlined in their statements of faith, and Heidelberg Catechism. A couple of denominations that follow Calvin's teachings include: The Reformed Church and The Christian Reformed Church.
The Reformed Church was founded by Ulrich Zwingli in Zurich in the period 1516-1519. The Reformed Church in the United States (German Reformed) was founded in 1725. The Dutch Reformed Church was founded in the U.S. in 1628.
Lutherans began as a movement to follow the teachings of Martin Luther, a German Catholic Priest trying to solve systemic problems in the Catholic Church. The Reformed Church is theologically very similar, but was started by the Dutch. They are both major Protestant Denominations. Neither one is considered a part of the other.
Third Reformed Church was created in 1875.
David's Reformed Church was created in 1881.
Memorial Reformed Church was created in 1887.
Owasco Reformed Church was created in 1815.
Harbaugh's Reformed Church was created in 1892.
Elmendorf Reformed Church was created in 1894.
Niskayuna Reformed Church was created in 1852.
Reformed Church of Shawangunk was created in 1755.
Reformed Church of Beacon was created in 1859.