20 to 30 Year Old Groups

Adas Israel
One of the largest and varied Jewish congregations in the DC area, they offer a young professionals group. This group consisting of 21 to 35 year olds offers opportunities for professionals to learn and enjoy events and holidays together. Events include BBQ’s, outings to the theatre, and attending concerts.
www.adasisrael.org/yp/

Billyfone
This website caters to people over 30 years and older interested in the Washington DC nightclubs and nightlife.
www.billyfone.com/scene.php?cityID=10&scid=13

GesherCity
GesherCity was established to provide social networks and community resources to young adults, ages 21-35, who are either new to the DC area of interested in getting connected to the Jewish community.  This program helps newcomers navigate Jewish life in Washington by providing them with all the resources they need to get settled, get out and get Jewish. Has online calendar of events.
www.geshercity.org

The Ivy Singles Social Club of Washington, DC
The Ivy Singles Social Club (ISSC) is a coalition of Ivy League, Seven Sister and other prestigious schools' regional alumni associations that sponsors social activities. The events are open to all single alumni of member schools and their guests. Most of the attendees are in their 30's, 40's or 50's, but all ages are welcome.
www.ivysingledc.com/events.html

Jewish Community Center of Greater Baltimore
Adults ages 22-32 are eligible for the Jewish Community Membership Six-Pack which includes an all-inclusive community package including membership to a synagogue and the JCC. Other offerings include Salon Meetings to discuss articles of Jewish content and “Got Shabbat” which are bi-monthly Shabbat dinner programs. 
www.jcc.org

Meetup Asian Going Out Group
This group is for young Asian-Pacific Islander professionals (or anyone who appreciates and enjoys being part of the APA community) in their 20s and 30s who enjoy dancing, dining, karaoke, clubs, dim sum, outdoor activities, road trips, and other local activities (APA films, dragon boat, lunar new year). It is for married people, single people, new-in-towners, and people who have been in the Washington DC area for a while and are simply looking for a new group to go out with. You only have to be friendly and fun to join!
www.meetup.com/20sand30sasiangroup/

Meetup Food and Wine Group
Join other young professionals in the DC area as we embark on culinary explorations with cooking classes, wine tastings, wine & dinner events, and much more!
www.meetup.com/20sand30sfoodandwinegroup

Meetup Going Out Group
This meetup is for people in their 20s and 30s, in the Washington DC metro area, who enjoy dancing, dining, pubs, clubs, outdoor activities, road trips, dinner parties, and other local activities. It is for married people, single people, new-in-towners, and people who have been in the DC area for a while and are simply looking for a new group to go out with.
www.20sand30sgroup.com

Meetup Washington DC
This website lists hundreds of groups aimed at matching up people depending on interest. Groups can be very specific or broad depending on age, location, religion, ethnicity and interest.  Some groups listed on the site cater to Jewish singles, over 30 singles, single parents, and singles living in particular communities in the DC metro area.     
www.meetup.com

Moishe House DC
Moishe House Silver Spring
Moishe House is a collection of homes throughout the United States that serve as a hub for young adult Jewish community (with an emphasis on ages 18-35). Shabbat dinners, movie nights, language classes, and more. 
www.theforestfoundation.net

Pros in the City-DC
Hundreds of events each year from speed dating to wine-tasting.  There are varied activities that are broken down by age groups : 21 to 29, 25 to 45 and 35 plus.  70% of the attendees are single.  (There is a separate group for Baltimore.) 
www.prosinthecity.com.

Things to do DC
A full calendar of events targeted for the young professionals of DC.  There is a separate 40 plus email list. Events range from cultural activities, formal galas to walking tours, lectures and dances.
www.thingstododc.com