ARBITRON 401(k) PLAN
Statements of Changes in Net Assets Available for Benefits
Years ended December 31, 2006 and 2005

		2006				2005
Additions to net assets attributed to:
Investment income:
Net appreciation in fair value of investments		$	3,993,032			$	1,572,839
Interest			40,399				30,307
Dividends			2,980,947				1,838,628
			7,014,378				3,441,774
Contributions:
Participant			5,269,026				4,909,071
Rollovers			510,354				432,197
Employer			2,360,673				2,108,451
			8,140,053				7,449,719
Total additions			15,154,431				10,891,493
Deductions from net assets attributed to:
Benefits paid to participants			5,651,161				4,657,489
Net increase			9,503,270				6,234,004
Net assets available for benefits:
Beginning of year			54,705,833				48,471,829
End of year		$	64,209,103			$	54,705,833

See the accompanying notes to the financial statements.

ARBITRON 401(k) PLAN
Notes to the Financial Statements
December 31, 2006 and 2005

1.		Description of Plan

General

The following description of Arbitron Inc.’s 401(k) plan (the “Plan”) provides general information only. Participants should refer to the Plan agreement for a more complete description of the Plan’s provisions.

The Plan is a defined contribution plan, qualified under Section 401(a) of the Internal Revenue Code of 1986, as amended (“IRC”), which includes provisions under Section 401(k) allowing an eligible participant to direct the employer to contribute a portion of the participant’s compensation to the Plan on a pre-tax basis through payroll deductions. Qualified employees, as defined by the Plan, who are U.S. citizens or resident aliens paid under the U.S. domestic payroll and who perform services for Arbitron Inc. (“Arbitron” or “the Company”) primarily within the United States or on a temporary foreign assignment, are eligible to participate in the Plan. The Plan is administered by Arbitron through its Retirement Plan Administrator and through its Retirement Committee, which is appointed by the Chief Executive Officer of the Company. The Plan is subject to the provisions of the Employee Retirement Income Security Act of 1974 (“ERISA”).

Description of the Company

Arbitron is an international media and marketing information services firm primarily serving radio, cable television, advertising agencies, advertisers, out-of-home media, online media and, through its Scarborough Research joint venture with The Nielsen Company, formerly known as VNU, Inc., broadcast television and print media.

Arbitron currently provides four main services: measuring radio audiences in local markets in the United States; measuring national radio audiences and the audience size and composition of network radio programs and commercials; providing application software used for accessing and analyzing media audience and marketing information data; and providing consumer, shopping and media usage information services to radio, cable television, advertising agencies, advertisers, retailers, out-of-home media, online industries and, through its Scarborough joint venture, broadcast television and print media.

Trust Agreement

Under the terms of a trust agreement between T. Rowe Price Retirement Plan Services, Inc., (the “Trustee”) and the Company, the Trustee holds, manages and invests contributions to the Plan and income therefrom in funds selected by the Company’s Retirement Committee to the extent directed by participants in the Plan. The Trustee carries its own banker’s blanket bond insuring against losses caused, among other things, by dishonesty of employees, burglary, robbery, misplacement, forgery and counterfeit money.

Contributions

Participants may contribute up to 17% of eligible earnings, as defined by the Plan, subject to certain limitations. During 2006 and 2005, the Plan administrator, in accordance with the terms of the Plan, limited participant contributions on behalf of highly compensated participants, as defined by the Plan, to 8% of their eligible earnings. For 2006 and 2005, the IRC limited the total salary deferral contributions of any participant to $15,000 and $14,000, respectively for participants under age 50, and $20,000 and $18,000, respectively for participants age 50 and over.

ARBITRON 401(k) PLAN
Notes to the Financial Statements-Continued
December 31, 2006 and 2005

Company matching contributions were determined on the basis of 50% for 2006 and 2005 of a participant’s contributions, up to a maximum of 6% of eligible earnings (3% for participants who also participated in the Company’s defined benefit pension plan), and did not require the satisfaction of performance criteria. The year-end performance-based contribution resulted from the achievement of certain Company performance criteria and amounted to 22.0% and 20.0% of a participant’s contribution during 2006 and 2005, respectively, up to a maximum of 6% of eligible compensation (3% for participants who also participated in the Company’s defined benefit pension plan), for participants who were employees at the respective year ends. The Company made basic monthly matching contributions totaling $1,673,119 and $1,547,976, for the years ended December 31, 2006 and 2005, respectively. The Company also declared a year-end performance matching contribution of $687,554 and $560,475, for 2006 and 2005, respectively. Contributions to participant accounts are limited to the lesser of $44,000 or 100% of a participant’s annual salary for 2006.

Participant Accounts and Vesting

The Trustee maintains an account for each participant, including participant directed allocations to each investment fund. Each participant’s account is credited with the participant’s contribution and allocations of any employer contribution and Plan earnings, less loans and withdrawals, based on the direction of the participant. Participants in the Plan who also participate in the Company’s defined benefit pension plan are immediately vested in their contributions and employer contributions, plus actual earnings thereon. Participants in the Plan who do not participate in the Company’s defined benefit pension plan are immediately vested in their pretax contributions and employer basic matching contributions, plus earnings thereon, and generally will acquire an interest in performance-based matching contributions in accordance with years of service as noted in the following schedule:

Less than two years			0	%
Two years			40	%
Three years			60	%
Four years			80	%
Five or more years			100	%

Forfeitures of employer performance-based matching contributions are used to reduce future employer contributions and can be used to pay expenses of administering the Plan. Forfeitures for the years ended December 31, 2006 and 2005 were $32,875 and $25,190, respectively. The amounts of forfeited nonvested accounts not allocated to participant accounts as of December 31, 2006 and 2005, were $75,745 and $40,266, respectively.

Withdrawals

Participants who are age 59 ¹/2 or older may withdraw from their vested account balance. Additionally, participants who are employed by the Company may withdraw from their vested account balance for “financial hardship,” as defined by federal regulations or for total disability. Participants may also withdraw their rollover contributions and investment earnings on these contributions. Withdrawals are also permitted pursuant to a qualified domestic relations order or in the event of termination of employment, retirement or death.

ARBITRON 401(k) PLAN
Notes to the Financial Statements-Continued
December 31, 2006 and 2005

Reconciliation of Financial Statements to Form 5500

The amount, if any, allocated to withdrawing participants should be recorded on the Form 5500 for benefit claims that were processed and approved for payment prior to year end, but not yet paid as of that date. There were no such claims processed and approved prior to the years ended December 31, 2006 and 2005, but not yet paid as of those dates. See reconciliation below to Form 5500.

The following is a reconciliation of benefits paid to participants per the financial statements for the years ended December 31, 2006, and 2005, to the Form 5500:

		Years Ended December 31,
		2006				2005
Benefits paid to participants per the financial statements		$	5,651,161			$	4,657,489
Less: Amounts allocated to withdrawing participants			—				(29,246	)
Benefits paid to participants per the Form 5500		$	5,651,161			$	4,628,243

Loans

Participants may borrow up to 50% of their before-tax salary deferral contributions, rollover contributions, and investment earnings on those contributions. Loans must be in a multiple of $100, be at least $1,000, and not be more than $50,000 less the amount of the highest loan balance outstanding during the 12-month period that ends the day before the loan is made. Participants may not have more than two short-term loans (maturity of five years or less) and one long-term loan (maturity over five and not to exceed ten years) outstanding. Effective January 1 and July 1, the Plan administrator sets the interest rate to be charged on all Plan loans made during the subsequent six-month period and the interest rate is based on the prime interest rate charged by major national banks. The Plan administrator or a delegate approves each loan, and the Trustee maintains a loan receivable account for any participant with an outstanding loan.

Income Tax Status

The Plan obtained its latest determination letter on April 23, 2003, in which the Internal Revenue Service stated that the Plan, as then designed, was in compliance with the applicable requirements of the IRC. The Plan has been amended since receiving the determination letter. However, the Plan administrator and Company management believe that the Plan is currently designed and being operated in compliance with the applicable requirements of the IRC and that the trust established thereunder is exempt from federal income taxes under Section 501(a) of the IRC. Contributions to the Plan are not included in the participant’s taxable income for federal and, in most states, state income tax purposes until distributed or withdrawn. Each participant’s portion of earnings from the investments made with contributions under the Plan are not taxable until distributed or withdrawn.

Related Party Transactions

The Trustee is a party-in-interest with respect to the Plan since the Trustee manages certain Plan investments. In the opinion of the Trustee and management of the Company, transactions between the Plan and the Trustee are exempt from being considered as prohibited transactions under ERISA section 408(b). The Plan, through the Trustee, has invested in the shares of the Company’s common stock. As of December 31, 2006 and 2005, the Plan’s investment in the Company’s common stock consisted of 42,690 and 46,615 shares, respectively, with a fair market value of $1,854,472 and $1,770,450, respectively. The Company pays the cost of administrating the Plan.

ARBITRON 401(k) PLAN
Notes to the Financial Statements-Continued
December 31, 2006 and 2005

2.		Summary of Significant Accounting Policies

Basis of Presentation

The accompanying financial statements of the Plan have been prepared on the accrual basis of accounting.

Use of Estimates

The preparation of financial statements in conformity with U.S. generally accepted accounting principles requires Plan management to make estimates and assumptions that affect the reported amounts of net assets available for benefits and changes therein, and disclosure of any contingent assets and liabilities at the date of the financial statements. Actual results could differ from those estimates.

Investment Valuation and Income Recognition

Investments are stated at fair value. Investments in the Company’s common stock are valued at closing prices published in the Consolidated Transaction Reporting System of the New York Stock Exchange. Investments in mutual funds are valued using daily net asset value calculations performed by the funds and published by the National Association of Securities Dealers. Participant loans are valued at the principal amount plus accrued interest, which approximates fair value. Net realized gains or losses are recognized by the Plan upon the sale of its investments or portions thereof on the basis of average cost to each investment program. Purchases and sales of securities are recorded on a trade date basis. Dividends are recorded on the ex-dividend date. Interest is recognized when earned.

The Plan’s investments are exposed to certain risks such as interest rate, credit and overall market volatility. Due to the level of risk associated with certain investment securities, changes in the value of investment securities could occur in the near term, and these changes could materially affect the amounts reported in the statements of net assets available for benefits and the statements of changes in net assets available for benefits.

Payment of Benefits

Benefits are recorded when paid.

Costs and Expenses

The Company pays costs and expenses of administering the Plan.

ARBITRON 401(k) PLAN
Notes to the Financial Statements-Continued
December 31, 2006 and 2005

3.		Investments

The following table summarizes the Plan’s investments that represent 5% or more of the net Plan assets available for benefits as of December 31, 2006 and 2005:

		As of December 31,
		2006				2005
T. Rowe Price Retirement Services Inc. Mutual Funds:
Equity Income Fund		$	9,526,311			$	8,384,656
Summit Cash Reserves Fund			9,139,493				8,307,296
Small-Cap Value Fund			6,910,995				5,824,410
New Horizons Fund			6,821,537				6,737,440
Capital Appreciation Fund			6,676,395				5,450,262
Equity Index 500 Fund			5,020,799				4,104,603
International Stock Fund			3,766,099				2,824,596

During the years ended December 31, 2006 and 2005, the Plan’s investments (including gains and losses on investments bought and sold, as well as held during the period) appreciated in value by $3,993,032 and $1,572,839, respectively, as follows:

		For the years ended December 31,
		2006				2005
Mutual funds appreciation		$	3,742,621			$	1,613,353
Common stock appreciation (depreciation)			250,411				(40,514	)
Net appreciation		$	3,993,032			$	1,572,839

4.		Plan Termination

Although it has not expressed any intent to do so, the Company has the right under the Plan to discontinue its contributions at any time and to terminate the Plan subject to the provisions of ERISA. In the event of Plan termination, participants will become 100% vested in their accounts. Any unallocated net assets of the Plan shall be allocated to participant accounts and distributed in such manner as the Company may determine.

ARBITRON 401(k) PLAN
Schedule H, Line 4i, — Schedule of Assets (Held at End of Year)
December 31, 2006

Identity of Issue and Investment Description		Current Value (1)
Common stock:
Arbitron Inc. *		$	1,854,472
T. Rowe Price Retirement Services Inc.* mutual funds:
Equity Income Fund			9,526,311
Summit Cash Reserves Fund			9,139,493
Small-Cap Value Fund			6,910,995
New Horizons Fund			6,821,537
Capital Appreciation Fund			6,676,395
Equity Index 500 Fund			5,020,799
International Stock Fund			3,766,099
Balanced Fund			3,132,938
New Income Fund			3,033,652
International Discovery Fund			2,736,293
Science and Technology Fund			1,197,669
			57,962,181
Other mutual funds:
Janus Growth and Income Fund			2,665,190
Participant loans* (Cost =$0: No. of loans = 257) with interest rates ranging from 5.00% to 9.25%			704,910
		$	63,186,753

See the accompanying report of the independent registered public accounting firm.

SIGNATURE

     The Plan. Pursuant to the requirements of the Securities Exchange Act of 1934, the trustees (or other persons who administer the employee benefit plan) have duly caused this annual report to be signed on its behalf by the undersigned hereunto duly authorized.