In fact, Washington, DC ranks second on the list of federal income tax paid per capita.
There are many arguments put forward by people who are either too lazy to think, or too politically motivated to stick with the status quo, regarding why the current state of affairs is a-ok. In fact, you are probably thinking some of these thoughts right now. However, like the good person that you are, I am sure that you will read on to gain a better perspective of the situation.
The first (and perhaps the most common sense) argument against Congressional representation for DC is that The District is just too small or doesn't have very many inhabitants. This myth could use some cold hard facts to dilute its power over people's minds. DC has a population of almost 600,000. Its population is greater than that of Wyoming. It is one of eight states whose population is under 1 million. It has an area of 63 square miles, larger than at least one country. With these facts in mind, it becomes difficult to understand why Wyoming, with a population of 79,000 less, is represented in Congress by 3 voting representatives, while DC is represented by zero.
The second myth that needs to be dispelled is the myth that District residents pay no income tax, and thus should not be given representatives in Congress. In fact, District residents do pay income tax, just like every resident of every state in the union, and they pay more per capita than 49 states. There is a perception among the poorly-informed that US Taxpayers from outside of The District foot the bill for most of what happens there. This is patently false. The truth is that District residents pay over $5 billion in taxes to the federal government (this number does not include regular federal income tax paid), similar to a state income tax or other state tax. This money is sent to the congress, where it is budgeted, and sent to the District's government to spend.