You need to specify in which country, because several countries refer to telephone area codes as "STD Codes"; see the related questions below.
In India, STD code 020, or +91 20 in international format, is Pune, Maharashtra.
In the UK, telephone area code 020 (or +44 20) is London, but there are not currently any valid numbers beginning with 020 2.
In North America, telephone area code 202 (or +1 202) is Washington, D.C., USA.
International telephone country code +20 is Egypt, and area code +20 2 (domestic area code 02) is Cairo.
(The plus sign means "insert your international access prefix here." From a GSM mobile phone, you can enter the number in full international format, starting with the plus sign. The most common prefix is 00, but North America (USA, Canada, etc.) uses 011, Japan uses 010, Australia uses 0011, and many other countries use different prefixes.)
202 is the area code for Washington DC.
In India, each city and state is assigned a Subscribing Trunk Dalling (STD) code. Once the city and state is provided, a STD code can be matched for that location.
That depends on which country you're talking about.
There are 300+ Zip Codes in area code 202, which is Washington, D.C.
In the UK, 0140 is an incomplete STD code (telephone area code); you need one more digit. In India, 0140 is an invalid STD code.
You need to specify the country; see the Related Questions below for examples.
STD code for France is 0033
I'm guessing that you mean STD = Subscriber Trunk Dialling (telephone area code) rather than STD = Sexually Transmitted Disease. STD code is another term used in some country for telephone area codes. The purpose of a telephone area code is to group telephone numbers by geographic area. In many cases, at least some calls to numbers with the same STD code as the caller can be dialed without the STD code, allowing shorter dialing sequences for many local calls.
202-509
ACE Cash Express has several locations in Washington, D.C., which is telephone area code 202.
This is impossible to answer. As 202 is an area code, one cannot calculate how many people live there by an area code specifically. There could be 3 people who live in a household.
90381123