U.S. Social Security Commissioner Stanford G. Ross earned over $200,000 last year and had assets between $503,000 and $1,360,000 at the end of the year, according to financial statements filed yesterday under the Ethics in Government Act.

Ross' boss and friend, Secretary of Health, Education and Welfare Joseph A. Califano Jr., Listed assets between $26,000 and $85,000. But this did not include the value of a blind trust, managed by Lehman Brothers, which is probably worth several hundred thousand dollars and possibly much more.

Ross was a lawyer in private practice in the firm of Caplin & Drysdale, tax specialists, for the first nine months last year, and then became commissioner of Social Security, a post in which he oversees distribution of over $100 billion in benefits to 35 million people.

His filing shows that he earned $194,151 in partnership income from the law firm, $442 from a speech early in 1978 and $11,678 from his government work.

In addition, he received between $17,700 and $64,500 in interes and dividends from stock and bond holdings, mostly from municipal bonds and mutual funds and savings accounts and some common stock, like AT&T.

The interest and dividends are given in the range $17,700 to $64,500 because the financial statement doesn't require reporting of the exact amount, but only ranges of interest earned for each security- $100 to $1,000, $1,000 to $2,500 and so on.

Assets, also reported in ranges of value, included Ross' Washington Home, valued at $100,000 to $250,000; a summer home in Wellfleet, Mass., valued at $50,000 to $100,000, and a condominum apartment in St. Louis (value to $50,000).

(Amounts owed on mortgages weren't indicated.)

His assets also included a "termination payment" from his law firm of somewhere between $100,000 and $250,000. Ross, in a telephone interiew, said this payment was taxable.

Assets also included big blocks of municipal bonds in New York, Michigan, New Jersey and the Rowe Price New Horizons Fund. All told, the total value of assets was in the range $503,000 to $1,360,000.

Califano, who was secretary of 'HEW all year, didn't have any outside earnings from employment, but listed $1,149 in royalties from his book, "A Presidential Nation," earnings in interest and dividends of between $15,000 and $50,000 from his blind trust, into which he put his securities holdings when he became secretary, and interest of up to $1,000 on a local bank account.

In addition, he listed combined assets worth between $6,000 and $20,000 in two properties; Tyco Road Ltd. in Falls Church and Tyco Road II; holdings worth $15,000 to $50,000 in Land Venture Associates of the District of Columbia, and a bank account of between $5,000 and $15,000 - total holdings of $26,000 to $85,000.

The value of the assets in the blind trust wasn't given, because, an aide said, the law doesn't require it. However, based on the interest being earned by the trust, which is indicated was $15,000 to $50,000 the value of the capital in the trust might be anywhere from $15,000 to $1 million. Califano also listed a "partial interest" in two natural gas leases.

Califano revealed a year ago that, in 1977, before becoming HEW secretary, he earned $555,000 as a senior partner in William & Connolly, the law firm with which he was associated with Edward Bennett Williams.

In yesterday's filings by Ross and Califano, the value of income and assets of wives and children were included int he totals.