X0101 EFFECT 33 LIVE 2006-08-17 0000932471-06-001178 485APOS 0000036405 VANGUARD INDEX FUNDS 002-56846 S000002839 Vanguard 500 Index Fund C000007773 Investor Shares S000002839 Vanguard 500 Index Fund C000007774 Admiral Shares S000002839 Vanguard 500 Index Fund C000035202 Signal Shares S000002840 Vanguard Value Index Fund C000007775 Investor Shares S000002840 Vanguard Value Index Fund C000007776 Admiral Shares S000002840 Vanguard Value Index Fund C000007777 Institutional Shares S000002840 Vanguard Value Index Fund C000007778 ETF Shares S000002840 Vanguard Value Index Fund C000035203 Signal Shares S000002841 Vanguard Extended Market Index Fund C000007779 Investor Shares S000002841 Vanguard Extended Market Index Fund C000007780 Admiral Shares S000002841 Vanguard Extended Market Index Fund C000007781 Institutional Shares S000002841 Vanguard Extended Market Index Fund C000007782 ETF Shares S000002841 Vanguard Extended Market Index Fund C000035204 Signal Shares S000002842 Vanguard Growth Index Fund C000007783 Investor Shares S000002842 Vanguard Growth Index Fund C000007784 Admiral Shares S000002842 Vanguard Growth Index Fund C000007785 Institutional Shares S000002842 Vanguard Growth Index Fund C000007786 ETF Shares S000002842 Vanguard Growth Index Fund C000035205 Signal Shares S000002843 Vanguard Large-Cap Index Fund C000007787 Investor Shares S000002843 Vanguard Large-Cap Index Fund C000007788 Admiral Shares S000002843 Vanguard Large-Cap Index Fund C000007789 Institutional Shares S000002843 Vanguard Large-Cap Index Fund C000007790 ETF Shares S000002843 Vanguard Large-Cap Index Fund C000035206 Signal Shares S000002844 Vanguard Mid-Cap Index Fund C000007791 Investor Shares S000002844 Vanguard Mid-Cap Index Fund C000007792 Admiral Shares S000002844 Vanguard Mid-Cap Index Fund C000007793 Institutional Shares S000002844 Vanguard Mid-Cap Index Fund C000007794 ETF Shares S000002844 Vanguard Mid-Cap Index Fund C000035207 Signal Shares S000002845 Vanguard Small-Cap Index Fund C000007795 Investor Shares S000002845 Vanguard Small-Cap Index Fund C000007796 Admiral Shares S000002845 Vanguard Small-Cap Index Fund C000007797 Institutional Shares S000002845 Vanguard Small-Cap Index Fund C000007798 ETF Shares S000002845 Vanguard Small-Cap Index Fund C000035208 Signal Shares S000002846 Vanguard Small-Cap Growth Index Fund C000007799 Investor Shares S000002846 Vanguard Small-Cap Growth Index Fund C000007800 Institutional Shares S000002846 Vanguard Small-Cap Growth Index Fund C000007801 ETF Shares S000002847 Vanguard Small-Cap Value Index Fund C000007802 Investor Shares S000002847 Vanguard Small-Cap Value Index Fund C000007803 Institutional Shares S000002847 Vanguard Small-Cap Value Index Fund C000007804 ETF Shares S000002848 Vanguard Total Stock Market Index Fund C000007805 Investor Shares S000002848 Vanguard Total Stock Market Index Fund C000007806 Admiral Shares S000002848 Vanguard Total Stock Market Index Fund C000007807 Institutional Shares S000002848 Vanguard Total Stock Market Index Fund C000007808 ETF Shares S000002848 Vanguard Total Stock Market Index Fund C000035211 Signal Shares S000012756 Vanguard Mid-Cap Growth Index Fund C000034427 Investor Shares S000012756 Vanguard Mid-Cap Growth Index Fund C000034428 ETF Shares S000012757 Vanguard Mid-Cap Value Index Fund C000034429 Investor Shares S000012757 Vanguard Mid-Cap Value Index Fund C000034430 ETF Shares