I "lived" in DC on less, but piled up debt on credit cards, I wouldnt recommend for long term.
Some things to consider:
Cell phone bill - $40-110 depending on your service.
Blackberry- is your office paying for yours? I dont have one, but I imagine its about $200 or more.
Blackberry phone bill - ???
Laundry detergent, toiletries, makeup, running shoes, etc, all need to be replaced on a routine basis and the costs sneak up on you - naturally if you already budget well, this shouldnt add a new complication to your life.
Books/DVDs add up too, try to get a DC library card, but it always seems like they're under construction, so I never did.
Taxis: $10 to go anywhere within dc proper from Adams Morgan. (you'll need it for your trips to H street at the very least since the buses are pretty unreliable).
Metro - $2.60 per day ($936 per year) to go anywhere in dc proper roundtrip, more if you go further or make multiple stops.
Renters Insurance - $50-100 (GET IT. Infrastruce and pipes in dc do collapse and cause huge problems- just look at the house on the corner of 14th and T that probably has been condemned for over a year) - and thats in the "best" area of dc - dupont circle.
Eating out vs grocery shopping - are you a savvy shopper? Because food gets expensive.
Health insurance- $100- $450 per month-- is your company paying for this, because I had to pay for all of my prescriptions out of pocket since my health insurance at my presigious law firm f-d me over and upped their prices 3 months down the road...protect yourself and ask about this before signing up - it may be wiser to invest in a private health insurance.
Car - parking permit for onstreet parking in dupont runs $250-$400 - parking spot in a lot at or near your job will cost the same.
Parking ticket - $100+ (Very easy to get in DC - I had my car there 4 days out of a year and got tickets every time, once for being a MINUTE literally, late to get back.)
Theft - my mail packages were often stolen by one of DC's 9000 homeless, caught by the cops and ened up in police property center which they never got back to me despite my repeated attempts to get it from them (sigh, long story dont ask).
and my bike was stolen. $400 down the drain. A lot of bike hacks who will steal your bike and hack it for parts so its not identifiable anymore in DC.
Music - $8-30 a night if you like to do this in your free time. Twice a week = eight times a month = $32-240 a month.
Events like the ballet, etc. are also expensive, but some events are free at Kennedy Center. Also, many FREE events take place on the Mall, there are also a lot of outdoor movie nights, first fridays, artomatic (i think its free, cant remember, but this is one event worth paying for) etc.
Cocktails can run up to NY prices at some bars. (*ahem, Tabaq ).
Anyhow, yes, you can live on this salary if you budget well, many young people do. Get a credit card for emergencies, just in case your car is stolen or something crazy happens. best of luck.
Definitely take advantage of free lunches or cocktails offered at your workplace, try to walk as much as possible, and dont bring a lot of furniture.