<PAGE>

                                   FORM 10-Q

                      SECURITIES AND EXCHANGE COMMISSION
                            Washington, D.C. 20549


(Mark One)
[x]     Quarterly report pursuant to Section 13 or 15(d) of the Securities
        Exchange Act of 1934
For the quarterly period ended March 31, 2000
                               --------------

[ ]     Transition report pursuant to Section 13 or 15(d) of the Securities
        Exchange Act of 1934
For the transition period from ___________ to ___________

        Commission File Number:  0-15714

                       JONES CABLE INCOME FUND 1-C, LTD.
--------------------------------------------------------------------------------
               Exact name of registrant as specified in charter

Colorado                                                              84-1010419
--------------------------------------------------------------------------------
State of organization                                     I.R.S. employer I.D. #

                            c/o Comcast Corporation
                1500 Market Street, Philadelphia, PA 19102-2148
                -----------------------------------------------
                     Address of principal executive office

                                (215) 665-1700
                         -----------------------------
                         Registrant's telephone number


Indicate by check mark whether the registrant (1) has filed all reports required
to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during
the preceding 12 months (or for such shorter period that the registrant was
required to file such reports), and (2) has been subject to such filing
requirements for the past 90 days.

Yes    X                                                              No
    ------                                                               -------
<PAGE>

                       JONES CABLE INCOME FUND 1-C, LTD.
                       ---------------------------------
                            (A Limited Partnership)

                     UNAUDITED CONSOLIDATED BALANCE SHEETS
                     -------------------------------------

<TABLE>
<CAPTION>

                                                                         March 31,               December 31,
                                     ASSETS                                2000                      1999
                                     ------                         -------------------      --------------------
<S>                                                                 <C>                      <C>
Cash                                                                $        6,199,035       $         7,033,894

Proceeds from sale in interest-bearing account                                 515,000                   509,375
                                                                    -------------------      --------------------
          Total assets                                              $        6,714,035       $         7,543,269
                                                                    ===================      ====================

                       LIABILITIES AND PARTNERS' CAPITAL
                       ---------------------------------
LIABILITIES:
  Accrued distribution to limited partners                          $                -       $         2,700,000
  Accrued distribution to Venture Partner                                      888,000                 2,500,000
  Advances from affiliates                                                   4,274,800                   734,773
                                                                    -------------------      --------------------
          Total liabilities                                                  5,162,800                 5,934,773
                                                                    -------------------      --------------------
MINORITY INTEREST IN JOINT VENTURE                                             226,549                   249,321
                                                                    -------------------      --------------------
PARTNER'S CAPITAL:
  General Partner-
     Contributed capital                                                         1,000                     1,000
     Accumulated earnings                                                      112,443                   112,443
     Distributions                                                            (113,443)                 (113,443)
                                                                    -------------------      --------------------
                                                                                     -                         -
                                                                    -------------------      --------------------
Limited Partners-
  Net contributed capital (85,059 units outstanding
    at March 31, 2000 and December 31, 1999)                                34,909,262                34,909,262
  Accumulated earnings                                                      14,295,129                14,329,618
  Distributions                                                            (47,879,705)              (47,879,705)
                                                                    -------------------      --------------------
                                                                             1,324,686                 1,359,175
                                                                    -------------------      --------------------
          Total liabilities and partners' capital                   $        6,714,035       $         7,543,269
                                                                    ===================      ====================

</TABLE>
     The accompanying notes to unaudited consolidated financial statements
     are an integral part of these unaudited consolidated balance sheets.

                                       2

<PAGE>

                       JONES CABLE INCOME FUND 1-C, LTD.
                       ---------------------------------
                            (A Limited Partnership)

                UNAUDITED CONSOLIDATED STATEMENTS OF OPERATIONS
                -----------------------------------------------

<TABLE>
<CAPTION>

                                                   For the Three Months Ended
                                                             March 31,
                                            ---------------------------------------------
                                                   2000                     1999
                                            -------------------      --------------------
<S>                                         <C>                      <C>
REVENUES                                    $                -       $           607,350

COSTS AND EXPENSES:
  Operating expenses                                         -                   371,932
  Management fees and allocated overhead
    from Jones Intercable                                    -                    73,792
  Depreciation and amortization                              -                   198,524
                                            -------------------      --------------------
OPERATING LOSS                                               -                   (36,898)
                                            -------------------      --------------------
OTHER INCOME (EXPENSE):
  Interest expense                                           -                   (50,574)
  Interest income                                       17,539                    15,114
  Other, net                                           (74,800)                  (54,517)
                                            -------------------      --------------------
          Total other income (expense), net            (57,261)                  (89,977)
                                            -------------------      --------------------
CONSOLIDATED LOSS                                      (57,261)                 (126,875)

MINORITY INTEREST IN CONSOLIDATED LOSS                  22,772                    50,458
                                            -------------------      --------------------
NET LOSS                                    $          (34,489)      $           (76,417)
                                            ===================      ====================
ALLOCATION OF NET LOSS:
  General Partner                           $                -       $              (764)
                                            ===================      ====================
  Limited Partners                          $          (34,489)      $           (75,653)
                                            ===================      ====================
NET LOSS PER LIMITED PARTNERSHIP UNIT       $            (0.41)      $             (0.89)
                                            ===================      ====================
WEIGHTED AVERAGE NUMBER OF LIMITED
  PARTNERSHIP UNITS OUTSTANDING                         85,059                    85,059
                                            ===================      ====================

</TABLE>
     The accompanying notes to unaudited consolidated financial statements
       are an integral part of these unaudited consolidated statements.

                                       3

<PAGE>

                       JONES CABLE INCOME FUND 1-C, LTD.
                       ---------------------------------
                            (A Limited Partnership)

                UNAUDITED CONSOLIDATED STATEMENTS OF CASH FLOWS
                -----------------------------------------------
<TABLE>
<CAPTION>
                                                                              For the Three Months Ended
                                                                                      March 31,
                                                                    ---------------------------------------------
                                                                            2000                     1999
                                                                    -------------------      --------------------
<S>                                                                 <C>                      <C>
CASH FLOWS FROM OPERATING ACTIVITIES:
  Net loss                                                          $          ( 34,489)      $           (76,417)
  Adjustments to reconcile net loss to net cash
    provided by (used in) operating activities:
          Depreciation and amortization                                               -                   198,524
          Minority interest in consolidated loss                                (22,772)                  (50,458)
          Increase in trade receivables, net                                          -                    (9,698)
          Increase in escrow proceeds                                            (5,625)                        -
          Decrease in deposits, prepaid expenses
            and deferred charges                                                      -                   328,804
          Decrease in advances from affiliates                                 (771,973)                 (380,881)
          Decrease in accounts payable and
            accrued liabilities and subscriber prepayments                            -                    (8,108)
                                                                    -------------------      --------------------
           Net cash provided by (used in) operating activities                 (834,859)                    1,766
                                                                    -------------------      --------------------
CASH FLOWS FROM INVESTING ACTIVITIES:
  Purchase of property and equipment, net                                             -                   (58,868)
                                                                    -------------------      --------------------
          Net cash used in investing activities                                       -                   (58,868)
                                                                    -------------------      --------------------
CASH FLOWS FROM FINANCING ACTIVITIES:
  Repayment of debt                                                                   -                    (3,817)
  Advances from affiliates                                                    2,700,000                         -
  Distribution to limited partners                                           (2,700,000)                        -
                                                                    -------------------      --------------------
          Net cash used in financing activities                                       -                    (3,817)
                                                                    -------------------      --------------------
Decrease in cash                                                               (834,859)                  (60,919)

Cash, beginning of period                                                     7,033,894                   118,938
                                                                    -------------------      --------------------
Cash, end of period                                                 $         6,199,035      $             58,019
                                                                    ===================      ====================
SUPPLEMENTAL CASH FLOW DISCLOSURE:
  Interest paid                                                     $            36,244      $             61,216
                                                                    ===================      ====================

</TABLE>
     The accompanying notes to unaudited consolidated financial statements
       are an integral part of these unaudited consolidated statements.

                                       4

<PAGE>

                       JONES CABLE INCOME FUND 1-C, LTD.
                       ---------------------------------
                            (A Limited Partnership)

             NOTES TO UNAUDITED CONSOLIDATED FINANCIAL STATEMENTS
             ----------------------------------------------------

(1)     This Form 10-Q is being filed in conformity with the SEC requirements
for unaudited financial statements and does not contain all of the necessary
footnote disclosures required for a complete presentation of the Balance Sheets
and Statements of Operations and Cash Flows in conformity with generally
accepted accounting principles. However, in the opinion of management, this data
includes all adjustments, consisting only of normal recurring accruals,
necessary to present fairly the financial position of Jones Cable Income Fund 1-
C, Ltd. (the "Partnership") at March 31, 2000 and December 31, 1999 and its
Statements of Operations and Cash Flows for the three month periods ended
March 31, 2000 and 1999. Certain prior year amounts were reclassified to conform
to the 2000 presentation.

        The accompanying consolidated financial statements include 100 percent
of the accounts of the Partnership and those of Jones Cable Income Fund 1-B/C
Venture (the "Venture") reduced by the 40 percent minority interest in the
Venture owned by Jones Cable Income Fund 1-B, Ltd. ("Fund 1-B"). All
interpartnership accounts and transactions have been eliminated. Neither the
Partnership nor the Venture currently own any cable television systems. The
Partnership and the Venture are expected to be dissolved in 2000.

        On April 7, 1999, Comcast Corporation ("Comcast") completed the
acquisition of a controlling interest in Jones Intercable, Inc. ("Jones
Intercable"), the Partnership's general partner until March 2, 2000. In December
1999, Comcast and Jones Intercable entered into a definitive merger agreement
pursuant to which Comcast agreed to acquire all of the outstanding shares of
Jones Intercable not yet owned by Comcast. On March 2, 2000, Jones Intercable
was merged with and into Comcast JOIN Holdings, Inc., a wholly owned subsidiary
of Comcast. Comcast JOIN Holdings, Inc. continues as the surviving corporation
of the merger. As a result of this transaction, Jones Intercable no longer
exists and Comcast JOIN Holdings, Inc. is now the general partner of the
Partnership. References in these Notes to "the General Partner" refer to Comcast
JOIN Holdings, Inc. The General Partner shares corporate offices with Comcast at
1500 Market Street, Philadelphia, Pennsylvania 19102-2148.

(2)     On July 30, 1999, the Venture sold the Myrtle Creek System to an
unaffiliated party for a sales price of $9,614,208. From the sale proceeds, the
Venture repaid the outstanding balance on its credit facility of $2,400,000,
paid a $240,355 brokerage fee to The Intercable Group, Ltd., a subsidiary of
Jones Intercable, representing 2.5 percent of the sales price, for acting as a
broker in the transaction, settled working capital adjustments, and deposited
$500,000 into an interest-bearing indemnity escrow account. The remaining sale
proceeds of $6,300,000 were distributed 60 percent to the Partnership and 40
percent to Fund 1-B. From the Partnership's $3,800,000 portion of this amount,
the Partnership retained $1,100,000 to cover its administrative expenses and the
balance was distributed in January 2000 to the Partnership's limited partners of
record as of the July 30, 1999 closing date of the sale of the Myrtle Creek
System. The $2,700,000 distributed to the Partnership's limited partners from
the sale of the Myrtle Creek System resulted in a distribution to limited
partners of $32 for each $500 limited partnership interest, or $64 for each
$1,000 invested in the Partnership.

        For a period of one year following the closing date, $500,000 of the
sale proceeds will remain in escrow as security for the Venture's agreement to
indemnify the buyer under the asset purchase agreement. The Venture's primary
exposure, if any, will relate to the representations and warranties made about
the Myrtle Creek System in the asset purchase agreement. Any amounts remaining
from this indemnity escrow account and not claimed by the buyer at the end of
the one-year escrow period plus interest earned on the escrowed funds will be
returned to the Venture.

                                       5
<PAGE>

        Although the sale of the Myrtle Creek System represented the sale of the
only remaining operating asset of the Venture, and the Partnership's interest in
the Venture represents its only asset, the Venture and the Partnership will not
be dissolved until all proceeds from escrow have been distributed.

(3)     The Venture reimburses the Partnership's general partner for certain
administrative expenses. These expenses represent the salaries and related
benefits paid for corporate personnel. Such personnel provide administrative,
accounting, tax, legal and investor relations services to the Venture and its
constituent partnerships. Such services, and their related costs, are necessary
to the administration of the Venture and its constituent partnerships until they
are dissolved. Such costs were charged to operating costs during the periods
that the Venture operated its cable television systems. Subsequent to the sale
of the Venture's final cable television system, such costs were charged to other
expense. Reimbursements made by the Venture to Jones Intercable for overhead and
administrative expenses during the three month periods ended March 31, 2000 and
1999 were $29,076 and $43,424, respectively.

                                       6
<PAGE>

                       JONES CABLE INCOME FUND 1-C, LTD.
                       ---------------------------------
                            (A Limited Partnership)

        MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND
        ---------------------------------------------------------------
                             RESULTS OF OPERATIONS
                             ---------------------

FINANCIAL CONDITION
-------------------

        The Partnership owns a 60 percent interest in the Venture and Fund 1-B
owns a 40 percent interest in the Venture. The accompanying financial statements
include 100 percent of the accounts of the Partnership and those of the Venture
reduced by Fund 1-B's 40 percent minority interest in the Venture.

        On July 30, 1999, the Venture sold the Myrtle Creek System to an
unaffiliated party for a sales price of $9,614,208. From the sale proceeds, the
Venture repaid all of its indebtedness, paid a brokerage fee, settled working
capital adjustments and deposited $500,000 into an interest-bearing indemnity
escrow account. The remaining sale proceeds of $6,300,000 were distributed 60
percent to the Partnership and 40 percent to Fund 1-B. From the Partnership's
$3,800,000 portion of this amount, the Partnership retained $1,100,000 to cover
its administrative expenses and the balance was distributed in January 2000 to
the Partnership's limited partners of record as of the July 30, 1999 closing
date of the sale of the Myrtle Creek System. The $2,700,000 distributed to the
Partnership's limited partners from the sale of the Myrtle Creek System resulted
in a distribution to limited partners of $32 for each $500 limited partnership
interest, or $64 for each $1,000 invested in the Partnership.

        For a period of one year following the closing date, $500,000 of the
sale proceeds will remain in escrow as security for the Venture's agreement to
indemnify the buyer under the asset purchase agreement. The Venture's primary
exposure, if any, will relate to the representations and warranties made about
the Myrtle Creek System in the asset purchase agreement. Any amounts remaining
from this indemnity escrow account and not claimed by the buyer at the end of
the one-year escrow period plus interest earned on the escrowed funds will be
returned to the Venture.

        Although the sale of the Myrtle Creek System represented the sale of the
only remaining operating asset of the Venture, and the Partnership's interest in
the Venture represents its only asset, the Venture and the Partnership will not
be dissolved until all proceeds from escrow have been distributed.

RESULTS OF OPERATIONS
---------------------

        Neither the Partnership nor the Venture currently own any cable
television systems; therefore, a discussion of results of operations would not
be meaningful. Other expense of $74,800 incurred in the first quarter of 2000
related to various costs associated with the administration of the Venture and
its constituent partnerships.

                                       7
<PAGE>

                          PART II - OTHER INFORMATION


Item 6.  Exhibits and Reports on Form 8-K.

         a)  Exhibits

             27)  Financial Data Schedule

         b)  Reports on Form 8-K

             None.

                                       8
<PAGE>

                                  SIGNATURES


        Pursuant to the requirements of the Securities Exchange Act of 1934, the
registrant has duly caused this report to be signed on its behalf by the
undersigned thereunto duly authorized.

                              JONES CABLE INCOME FUND 1-C, LTD.
                              BY:  COMCAST JOIN HOLDINGS, INC.
                                   General Partner



                              By:  /S/ Lawrence J. Salva
                                   ---------------------
                                   Lawrence J. Salva
                                   Senior Vice President
                                   (Principal Accounting Officer)






Dated:  May 15, 2000

                                       9