There are a number of OSB's with no outside apostolate who sing the office:
--sung Latin with Gregorian chant:
Petersham Priory in Massachusetts.
9 professed nuns. habit. Sing Greg chant in Latin.
guest house on 200 wooded acres, next to 10,000 more nearby.
www.petershampriory.org.
Our Lady of the Rock--
http://www.rockisland.com/~mhildegard/--in San Juan Islands of Washington State. Founded by Regina Loudis and like them, wear full habit, sing office in Latin with Gregorian chant. Raise rare breeds of animals and arts and crafts.
St. Walburga in Virginia Dale CO --www.walburga.org
Growing, full habit, sung mass and Office, mixed English and Latin. Retreats, farming, altar breads.
And others which sing the office in English or English and Latin:
Our Lady of the Desert, the companion order to Christ in the Desert, which Staretz is entering. They are small, moving elsewhere in NM for more land, multinational. Modified Benedictine habit. Chant the DO in Greg Chant in English. www.ourladyofthedesert.org.
Our Lady Queen Monastery Tickfaw, Louisiana
http://www.ourladyqueenmonastery.org/Small-5 nuns in the chapel picture, but have postulants. Modified habit, sing full office-don’t know what in. Retreat house.
Sisters of St. Emma-- Greenburg PA
Full habit. Sing office in English with ‘simplified Gregorian “ chant. Retreats. Novice in the pictures.
Monastery of St. Benedict Canyon, Texas--http://www.osbcanyontx.org/
-small community, modified habit, postulants, chants the seven hours in English; ministry retreats.
One house of Cistercian nuns, a branch of the Benedictines, sings the office in Latin using the Cistercian chant. Growing steadily.
http://www.nunocist.org/And the Trappistines are in five different houses in the US. They sing the seven hours, but it’s not clear in what chant or what language.
http://www.osb.org/cist/index.html#na