Długa Kościelna is a village in the administrative district of Gmina Halinów, within Mińsk County, Masovian Voivodeship, in east-central Poland. It borders the town of Halinów in the south and lies approximately west of Mińsk Mazowiecki and east of Warsaw.
There are two churches and parishes in the village: the Catholic Saint Anne church and the Catholic Mariavite Blessed Sacrament church.
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